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Frequently Asked Questions

General Questions

What are microgreens?

Microgreens are young vegetable greens harvested 7-14 days after germination. They're packed with nutrients—often containing 4-40 times more vitamins and antioxidants than mature plants—and add fresh flavor to meals. Common varieties include broccoli, radish, sunflower, and peas.

Where do you buy microgreen seeds?

We have been buying our Microgreen Seeds from Trueleaf Market for 7 years now! They are a trustworthy supplier, with fair pricing. When picking seeds, buying in bulk has a higher upfront cost, however it will save you money in the end. Click here for the seed supplier.

Read our blog: The Benefits and Disadvantages of Buying Microgreen Seeds in Bulk Rather Than Small Batches

How long do microgreens take to grow?

Most varieties grow in 7-14 days from seed to harvest. Fast-growing varieties like radish can be ready in as little as 6 days, while slower varieties like basil may take up to 21 days.

Do I need special equipment to grow microgreens?

You can start with basic trays, growing medium, and seeds. Our 7x14 Microgreen Tray Kit includes everything except seeds for beginners. You'll also need a light source—either a sunny windowsill or a grow light.

Can I grow microgreens without soil?

Yes! You can grow microgreens hydroponically using reusable silicone grow mediums, coco coir, or directly on mesh trays. This keeps your growing area cleaner and minimizes the need for soil.

Are microgreens the same as sprouts?

No. Sprouts are germinated seeds eaten whole (roots, seeds, and shoots) within 2-7 days. Microgreens are grown in soil or growing medium for 7-21 days and harvested by cutting the stems, leaving roots behind.

Read our blog: Sprouts vs. Microgreens: Key Differences & Nutritional Benefits

Read out blog: Why We Don't Eat Microgreen Roots Like Sprouts

Do microgreens regrow after cutting?

Most microgreens do not regrow after harvest. A few varieties like peas may produce a small second cutting, but quality and yield decline significantly. It's best to start a new tray for consistent results.

Read out blog: Will Microgreens Regrow After Harvesting?

Where can I learn to grow microgreens?

We offer multiple learning resources:

Can I grow microgreens year-round?

Yes! One of the biggest advantages of microgreens is that they can be grown indoors any time of year, regardless of your climate or season. As long as you have a light source (a grow light or sunny windowsill), consistent temperatures between 65-75°F, and basic supplies, you can grow fresh microgreens 365 days a year. This makes them one of the most accessible crops for home growers—no backyard, garden bed, or growing season required.

Can I grow microgreens in an apartment or small space?

Absolutely! Microgreens are one of the best crops for small-space living. A single tray can sit on a kitchen counter, windowsill, or small shelf. Our 7x14 Microgreen Tray Kit was designed specifically for compact spaces and produces enough microgreens for a small family each week. Our Small Sprouting Tray Set is even more compact—perfect for dorm rooms, RVs, or tiny kitchens. No outdoor space, garden, or special room needed. If you have a flat surface and a light source, you can grow microgreens.

What plants should NOT be grown as microgreens?

Some plants are toxic at the seedling stage and should never be grown or consumed as microgreens. These include nightshade family plants—tomatoes, peppers, eggplant, and potatoes—which contain alkaloids (like solanine) that are harmful to humans at the seedling stage. You should also avoid any ornamental plants, sweet peas (not to be confused with regular garden peas, which are safe), and any wild plant seeds you cannot positively identify. When in doubt, stick to seeds specifically labeled for microgreen or sprouting use from reputable suppliers like Trueleaf Market.

Can I grow microgreens year-round indoors without a grow light?

You can, but results will vary. A sunny south-facing windowsill can work during months with strong natural light, but you'll likely notice leggy, pale, or slow-growing microgreens during shorter winter days or in spaces without direct sunlight. For consistent results year-round, we recommend using an LED grow light positioned 6-12 inches above your trays for 12-16 hours daily. Even a basic, affordable shop-style LED light makes a noticeable difference in stem thickness, color, and overall quality.

Read our blog: The Complete Guide to Microgreen Lighting

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Using and Eating Microgreens

How do I eat microgreens? What can I use them for?

Microgreens are incredibly versatile! Here are the most popular ways to enjoy them:

  • Salads: Use as the base or mix with other greens for added flavor, color, and nutrition.
  • Sandwiches & wraps: Replace or add to lettuce for a fresh, flavorful crunch.
  • Smoothies: Blend a handful of microgreens (broccoli, pea shoots, sunflower, or kale work great) with fruit for a nutrient boost without much flavor change.
  • Garnish: Top soups, omelets, tacos, pizza, pasta, grain bowls, or avocado toast.
  • Pesto: Blend microgreens (especially arugula or basil) with olive oil, nuts, and parmesan for a nutrient-packed pesto.
  • Juicing: Pea shoots, broccoli, and wheatgrass microgreens juice well on their own or mixed with other produce.

The possibilities are endless. For more ideas, check out our books and course where we have recipes 

Read our blog: The Many Ways You Can Use Microgreens

Read our blog: The Mental Health Benefits of Microgreen Nutrition and Growing Microgreens

Should I eat microgreens raw or cooked?

For maximum nutritional benefit, eat microgreens raw. Cooking (especially high heat) can reduce some of the beneficial nutrients and enzymes—particularly sulforaphane in broccoli microgreens, which is activated when the greens are chewed or chopped raw.

That said, microgreens can absolutely be added to cooked dishes. The key is to add them at the very end—toss them onto a stir-fry just before serving, fold them into an omelet off the heat, or stir them into warm soup in the bowl. This preserves more nutrition while still getting the flavor and visual appeal in hot dishes.

Can I put microgreens in smoothies?

Yes! Smoothies are one of the easiest ways to get a daily serving of microgreens, especially if you're not a salad person. Broccoli, pea shoots, sunflower, and kale microgreens all blend well and their flavors are easily masked by fruit.

A simple starting recipe: blend a handful of microgreens with a banana, a cup of frozen fruit (berries, mango, or pineapple), and your choice of liquid (water, milk, or coconut water). You can also add chia seeds, protein powder, or yogurt.

Tip: If you harvest more than you can eat fresh, freeze your extra microgreens specifically for smoothie use. The texture won't hold up for fresh eating after freezing, but they blend perfectly and retain their nutritional value.

How many microgreens should I eat per day?

There is no official daily recommendation for microgreens. However, adding a small handful (about 1-2 ounces) to meals is a simple way to boost your daily nutrient intake. Think of it as adding an extra serving of vegetables to your diet. Since microgreens are nutrient-dense, a little goes a long way. As with any dietary change, listen to your body and consult with a healthcare professional if you have specific dietary concerns.

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Health & Nutrition 

What are the healthiest microgreens to grow?

While all microgreens are nutrient-dense, some varieties stand out based on available research:

  • Broccoli: Rich in sulforaphane and high in vitamins A, C, E, and K. Broccoli microgreens are the most researched variety for health benefits.
  • Radish: High in vitamins C and E, with powerful antioxidant activity. Also one of the fastest and easiest to grow.
  • Sunflower: Excellent source of protein, healthy fats, and B vitamins. One of the heartiest and most filling microgreens.
  • Pea shoots: High in protein (up to 35% by dry weight), fiber, and vitamins A and C. Great for smoothies and salads.
  • Kale: Packed with vitamins K, C, and A. Easy to grow and mild in flavor.
  • Red cabbage: Very high in vitamin C and contains anthocyanins (powerful antioxidants that give it the red/purple color).

Disclaimer: We are educators, not nutritionists or medical professionals. Nutritional content varies based on seed genetics, growing conditions, light quality, water quality, and other factors. We do not make specific nutritional or health claims about crops grown on our products. For nutritional data specific to your growing conditions, we recommend laboratory testing through an accredited food testing facility. Consult a healthcare professional for dietary advice.

Read our blog: The Mental Health Benefits of Microgreen Nutrition and Growing Microgreens

What is sulforaphane, and why are broccoli microgreens so popular?

Sulforaphane is a naturally occurring compound found in cruciferous vegetables (broccoli, kale, cabbage, cauliflower, etc.) that has been extensively studied by researchers for its antioxidant and health-promoting properties. It's formed when you chew or chop these vegetables, which activates an enzyme called myrosinase that converts a precursor compound (glucoraphanin) into sulforaphane.

Broccoli microgreens have gained significant attention because research suggests they contain substantially higher concentrations of glucoraphanin compared to mature broccoli. This is a key reason broccoli microgreens are currently the most popular and widely grown variety in the microgreens market.

To maximize sulforaphane formation, researchers suggest consuming broccoli microgreens raw and chopping them before eating to activate the enzyme reaction.

Disclaimer: We share this for educational purposes only. We are not nutritionists, medical professionals, or researchers, and we do not make health claims about our products. Nutrient content varies based on growing conditions. Consult a healthcare professional for health or dietary advice.

Are microgreens good for specific health conditions (weight loss, diabetes, etc.)?

There is growing scientific interest in the potential health applications of microgreens, and new research continues to emerge. However, we want to be transparent: we are educators and microgreen growers—not doctors, nutritionists, or medical researchers. We do not make health claims about our products or microgreens in general.

What the research broadly suggests is that microgreens are nutrient-dense, low in calories, and rich in vitamins, minerals, and antioxidants—qualities that can complement a healthy diet. Beyond that, any specific health questions should be directed to a qualified healthcare professional who understands your individual situation.

We focus on teaching you how to grow them well. What you do with that nutrition is between you and your doctor!

How do microgreens compare to sprouts nutritionally?

While we can't make specific nutritional claims, the general research landscape suggests both microgreens and sprouts are nutrient-dense, but in different ways. Sprouts are typically richer in certain enzymes due to their very early harvest stage (2-7 days). Microgreens, grown for 7-21 days with exposure to light, develop chlorophyll and a broader range of vitamins—particularly vitamins C, E, K, and beta-carotene—that require light to form. Some studies have suggested that certain microgreen varieties contain higher overall concentrations of some vitamins compared to both sprouts and mature vegetables.

The biggest practical differences are food safety and flavor. Microgreens are generally considered lower risk for foodborne illness because they're grown in ventilated conditions with air circulation (unlike sprouts, which grow in warm, moist, enclosed environments). Microgreens also tend to have more developed flavors and textures.

Disclaimer: We are educators, not nutritionists. For specific nutritional comparisons, we recommend consulting published research or a qualified nutritionist.

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Microgreens for Pets

Are microgreens safe for dogs?

Most microgreens that are safe for humans are also safe for dogs in small amounts. Popular dog-friendly varieties include wheatgrass, sunflower, broccoli, and kale microgreens. Dogs can benefit from the added vitamins, minerals, and fiber that microgreens provide as a supplement to their regular diet.

Important guidelines:

  • Start small: Introduce microgreens gradually and watch for any digestive reactions.
  • Keep it supplemental: Microgreens should make up no more than about 10% of your dog's daily diet.
  • Chop or blend: Mix chopped microgreens into their regular food for easier digestion.

Varieties to AVOID for dogs:

  • Onion and garlic (toxic to dogs—can cause anemia)
  • Oregano
  • Parsley (in large amounts)
  • Any nightshade family plants (tomato, pepper, eggplant)
  • Buckwheat (contains fagopyrin, which can cause light sensitivity)

We are not veterinarians. Always consult your vet before adding microgreens or any new food to your pet's diet, especially if your pet has allergies, sensitivities, or existing health conditions.

Are microgreens safe for cats?

Yes, certain microgreens are safe for cats in moderation. Cats are obligate carnivores, so microgreens should only be a very small supplement—no more than about 5% of their diet. Many cats naturally enjoy nibbling on greens, and offering safe microgreens is much better than letting them chew on potentially toxic houseplants.

Cat-safe microgreens include:

  • Wheatgrass (a longtime favorite—great for digestion and hairball reduction)
  • Sunflower
  • Broccoli
  • Alfalfa

Varieties to AVOID for cats:

  • Onion, garlic, leek, and chives (toxic—can cause anemia)
  • Any allium family plants
  • Any nightshade family plants

Growing a small tray of wheatgrass specifically for your cat is a fun, enriching option. It gives them something safe to graze on and can help with digestion. Just supervise until you know how they respond.

We are not veterinarians. Always consult your vet before introducing new foods to your cat's diet.

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 Microgreens for Educators & Classrooms

Can I use microgreens as a classroom or school project?

Microgreens make an excellent educational tool for classrooms of all ages! They're one of the best crops for hands-on STEM learning because they grow fast enough (7-14 days) to fit within a school project timeline, they require minimal space and equipment, and they teach real science concepts—germination, photosynthesis, plant biology, nutrition, and even basic business skills.

Our 7x14 Microgreen Tray Kit and Small Sprouting Tray Sets are great options for classroom settings. Pair them with our free downloadable PDF guides for lesson support.

We've had educators from middle school through college-level programs reach out about using our products and resources, many of have shown our YouTube videos to their classrooms even. While we don't currently offer formal certifications or institutional licensing, we're actively exploring options for educational programs. If you're an educator interested in using our resources for your classroom, email us at info@onthegrow.net—we'd love to hear about your program.

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Course & Learning Resources

What's the difference between your free content, Masterclass, and book?

All are valuable—choose based on your learning style and needs.

Do I get lifetime access to the Masterclass?

Yes! The Microgreen Masterclass includes lifetime access with all future updates. Learn at your own pace and revisit lessons anytime.

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Product Questions

What's the difference between silicone and stainless steel grow mediums?

Silicone is flexible, easy to clean, and dishwasher safe. It's great for beginners and works well with most seed varieties.

Stainless Steel is more durable, handles aggressive cleaning, and resists staining better. It's ideal for commercial growers or those who prefer a firmer growing surface.

Both are reusable for months with proper care. Compare both options here.

Read our blog: Silicone Reusable Microgreen Grow Medium - Complete Grow Medium Overview

Read our blog: Stainless Steel Reusable Microgreen Grow Medium - Complete Grow Medium Overview

How do I clean reusable grow mediums?

  1. Scrape off roots with our cleaning tool
  2. Wash with warm water and free-and-clear soap
  3. Sanitize with boiling water (1-2 minutes) after every grow
  4. Air dry completely before storage

Total cleanup time: about 5 minutes per sheet. Many growers will wash and sanitize in batches for quicker timing.

Read our blog: How to Clean and Sanitize Microgreen Trays and Reusable Grow Mediums: Complete Guide

How long do reusable grow mediums last?

With proper care, silicone and stainless steel grow mediums last for months of regular use. Replace them if tears, deep cuts, or excessive wear develops.

Are microgreens grown on your reusable mediums more nutritious than soil-grown microgreens?

We do not make any claims about nutritional content or nutrient density of crops grown on our products. Our reusable grow mediums (silicone and stainless steel) are inert materials - they do not add or remove nutrients.

Nutrient density is influenced by many factors unrelated to the growing medium, including seed genetics, light quality, water quality, fertilizers used, and growing conditions. While general research shows microgreens are nutrient-dense compared to mature vegetables, and hydroponic methods can produce nutrient-rich crops, we have not conducted laboratory testing specific to our products.

We are not nutritionists and cannot make nutritional claims. If you need nutritional data for your crops, we recommend conducting laboratory testing through an accredited food testing facility.

For more information, see our complete Nutritional Content Disclaimer.

What seeds can I grow on reusable grow mediums?

We've tested 70+ microgreen seed varieties on our reusable grow mediums! Medium-to-large seeds with manageable root systems perform best, including most brassicas (broccoli, kale, cabbage, mustard, kohlrabi), radishes, basil, and common salad mixes.

Some seeds—especially peas—have very aggressive roots that tangle deeply into the medium, making cleanup difficult. These grow better directly on a mesh tray. Very tiny seeds may fall through the mesh and do better on soil or coco coir.

For the complete seed compatibility breakdown with all 70+ varieties listed, check out our blog: 70+ Microgreen Seed Varieties and Reusable Grow Medium Compatibility. You can also find compatibility charts in the product photos on each reusable grow medium listing.

Which tray size should I start with?

The 7x14 OTG Microgreen Tray Kit is our most popular starter size. It's compact enough for countertops but produces enough microgreens for a small family. If you have more space, 10x20 trays are the commercial standard.

Do Bootstrap Farmer trays fit your products?

Yes! Our reusable grow mediums and tray clip labelers are designed to fit Bootstrap Farmer Heavy Duty 10x20 and 10x10 trays. 

What seeds work best with reusable grow mediums?

Works great with: Sunflower, radish, broccoli, arugula, kale, cabbage, kohlrabi, and most Brassica family seeds.

Does NOT work well with: Swiss chard, beets, cilantro. These varieties perform better on soil or coco coir.

See full compatibility chart on each listing in the photos

Are your products made in the USA?

Our Bootstrap Farmer trays are made in the USA. Our Microgreen Tray Clip Labelers are designed, manufactured, and assembled in-house by us in Texas. Some products are sourced internationally to provide the best quality at reasonable prices. Though we are working towards all USA based as pricing becomes more sustainable for small businesses.

Can I use your products with non-Bootstrap Farmer trays?

Our reusable grow mediums fit any standard 10x20 or 10x10 tray. Our Tray Clip Labelers are specifically designed for Bootstrap Farmer Heavy Duty trays and may not fit other brands due to rim thickness variations.

Are your products organic/food-safe certified?

Our reusable silicone and stainless steel grow mediums are made from food-grade materials. While the products themselves aren't "organic certified" (that applies to agricultural inputs), they're safe for organic growing practices. Our recommended fertilizer (OceanSolution 2-0-3) is OMRI-listed organic.

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Growing Questions

What pH should I use for hydroponic microgreens?

We recommend 5.5-6.0 pH for most microgreen varieties. Use a pH meter and pH up/down solutions to adjust your nutrient water. Download our Free Fertilizer Ratio Guide for detailed mixing instructions.

How much light do microgreens need?

Most microgreens need 12-16 hours of light per day. You can use:

  • Sunny windowsill (south-facing works best)
  • LED grow lights positioned 6-12 inches above trays
  • Fluorescent shop lights (budget-friendly option)

Insufficient light causes leggy, pale microgreens. Adequate light produces thick stems and vibrant colors.

Read our blog: The Complete Guide to Microgreen Lighting

Why are my microgreens molding?

Common causes:

  • Overwatering — Medium should be moist, not saturated
  • Poor airflow — Add a small fan for gentle circulation
  • High humidity — Keep humidity around 40-60%
  • Dirty equipment — Sanitize trays and mediums between grows

Download our Free Troubleshooting Guide for solutions.

Read our blog: Microgreens and Mold: The Complete Guide to Prevention, Identification, and Treatment

Can I use tap water?

It depends on your water quality. Most tap water works fine, but heavily chlorinated or very hard water can affect growth. If you notice problems, try filtered water or let tap water sit uncovered for 24 hours to off-gas chlorine.

Do I need fertilizer for microgreens?

Soil-grown: Usually no fertilizer needed if using quality potting mix.

Hydroponic (coco coir or reusable mediums): Yes, add hydroponic nutrients after germination. We use OceanSolution 2-0-3 at 0.5 oz per gallon for microgreens.

How do I prevent leggy microgreens?

  • Provide adequate light (12-16 hours daily)
  • Don't skip the blackout/weight phase during germination
  • Maintain proper temperature (65-75°F)
  • Ensure good airflow

Read our blog: Common Mistakes When Growing Microgreens (And How to Avoid Them)

What's the blackout method?

During germination (first 3-5 days), cover seeds with an upside-down tray or humidity dome to block light. This encourages strong stem development. Once seeds germinate 75%, move trays to light.

Read our blog: Knowing the Right Time to Transition Microgreen Trays from Weight to Blackout

Why are my microgreens yellowing?

Most common causes:

  • Insufficient light: Increase light duration (12-16 hours) or move lights closer (6-12 inches)
  • Nutrient deficiency: If growing hydroponically, ensure you're adding fertilizer after germination
  • Root problems: Check for root rot from overwatering

Yellowing at harvest time is normal as lower leaves age.

Read our blog: Common Mistakes When Growing Microgreens (And How to Avoid Them)

Why aren't my seeds germinating?

Check these factors:

  • Old seeds: Germination rates decline over time—use fresh seeds
  • Wrong temperature: Most seeds germinate best at 65-75°F
  • Too dry or too wet: Medium should be moist but not waterlogged during germination
  • Light exposure: Most seeds germinate better in darkness—use blackout method for first 3-5 days
  • Seed quality: Always use food-grade microgreen seeds, never bird seed

My microgreens taste bitter—what went wrong?

Common causes:

  • Harvested too late: Harvest at first true leaf stage for best flavor
  • Heat stress: Temperatures above 80°F can cause bitterness
  • Water stress: Inconsistent watering affects flavor
  • Variety selection: Some varieties (like mustard, arugula) are naturally spicier

Broccoli, sunflower, and peas are milder if you prefer less intense flavors.

What's the difference between soil, coco coir, and reusable grow mediums?

Each growing medium has pros and cons:

Soil is the most forgiving for beginners. It naturally holds moisture and contains some nutrients, so fertilizer isn't always necessary. The downside is cleanup—soil is messy and cannot be reused. Compost it after each grow.

Coco coir is a soil-free alternative made from coconut husks. It's cleaner than soil, holds moisture well, and works great for most varieties. It can be reused once or twice if sterilized, but quality degrades. You'll need hydroponic fertilizer since coco coir contains no nutrients.

Reusable grow mediums (silicone or stainless steel) are the cleanest, most sustainable option. They last for months with proper care, eliminate ongoing medium costs, and make cleanup fast. They do require hydroponic fertilizer and work best with medium-to-large seed varieties. See our seed compatibility information on each product listing.

For a detailed growing guide covering all three methods, read our blog: How to Grow Microgreens in 10x20 Trays.

What is the Kratky method for growing microgreens?

The Kratky method is a passive hydroponic technique where plants grow suspended above a nutrient-filled water reservoir—no pumps, no electricity, no complicated equipment. It's named after Dr. Bernard Kratky from the University of Hawaii.

For microgreens, the Kratky method works exceptionally well because of their short 7-14 day growth cycle. Roots only hang above the nutrient water for about 4-8 days, which greatly reduces the risk of root rot that can affect longer-growing crops.

We sell a complete 10x20 Kratky Hydroponics Tray Kit that includes everything you need to get started. For a full step-by-step walkthrough, check out our blog: Growing Microgreens Using the Kratky Method.

Do I need to soak microgreen seeds before planting?

It depends on the seed variety.

Seeds that benefit from soaking (8-12 hours): Larger seeds like peas, sunflower, and mung beans germinate faster and more evenly when pre-soaked. Soaking softens the hard outer shell and jumpstarts the germination process.

Seeds that do NOT need soaking: Most small-to-medium seeds like broccoli, radish, kale, arugula, cabbage, and mustard do not need soaking. Simply spread them on your growing medium, mist, and proceed with the blackout method.

Seeds you should NEVER soak: Mucilaginous seeds (like basil, chia, and flax) form a gel coating when wet. These should be spread dry on your medium and misted—do not soak them or they'll clump together into an unmanageable mass.

Can I freeze microgreens?

Yes, but only for use in smoothies or cooked dishes. Freezing destroys the crisp texture of microgreens, so they won't work for salads or garnishes after being frozen. However, freezing does preserve most of the nutritional value. Spread harvested microgreens on a baking sheet in a single layer, freeze for 1-2 hours, then transfer to a freezer bag. They'll keep for 2-3 months and blend perfectly into smoothies.

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Storage & Harvesting

How do I store harvested microgreens?

Store unwashed microgreens in an airtight container at 35-40°F (refrigerator temperature). Place a paper towel in the container to absorb excess moisture. Never wash microgreens before storage—only rinse right before eating. Properly stored microgreens stay fresh for 7-14 days depending on variety.

How long do microgreens last after harvest?

Most varieties last 7-14 days when stored properly (unwashed, 35-40°F, in airtight container with paper towel). Delicate varieties like basil may only last 5-7 days, while heartier varieties like sunflower and peas can last up to 2 weeks.

Should I wash microgreens before or after harvest?

Never wash before harvest or storage. Only rinse microgreens right before you're ready to eat them. Washing before storage introduces moisture that significantly shortens shelf life and increases spoilage risk.

What's the best way to harvest microgreens?

Use clean, sharp scissors or a knife. Cut stems just above the growing medium, leaving roots behind. Harvest in the morning after watering for maximum crispness. For cleanest harvest, bottom-water only (never top-water) during the growth phase to keep foliage clean.

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Yield & Planning

How much will one tray produce?

Typical yields per harvest:

  • 7x14 tray: 4-8 oz (enough for a small family for one week)
  • 10x20 tray: 8-16 oz depending on variety

Sunflower and peas produce the most weight. Smaller seeds like broccoli and radish produce less volume but are nutrient-dense.

How many seeds do I need per tray size?

Seeding density varies by variety:

  • Small seeds (broccoli, radish, arugula): 1-2 tablespoons per 10x20 tray
  • Medium seeds (sunflower): 1-1.5 cups per 10x20 tray
  • Large seeds (peas): 2-3 cups per 10x20 tray

For 7x14 trays, use about 1/3 of these amounts. Seeds should cover the surface in a single layer with minimal overlap. See our free guides or Masterclass for specific variety charts.

How many trays should I start with as a beginner?

Start with 2-4 trays and stagger planting every 3-4 days. This gives you a continuous harvest and helps you learn the process without waste. Once comfortable, scale up based on your consumption or sales needs.

Read our blog: Where to Start with Growing Microgreens: A Complete Beginner's Guide

What are the fastest microgreens to grow?

If you want the quickest harvest, these varieties are typically ready in under 10 days:

  • Radish: 6-8 days. One of the fastest and easiest to grow. Bold, peppery flavor.
  • Arugula: 7-10 days. Spicy, peppery kick.
  • Broccoli: 8-10 days. Mild flavor, packed with nutrition.
  • Kale: 8-10 days. Mild, versatile, and easy for beginners.
  • Mustard: 7-10 days. Ranges from mild to spicy depending on variety.

Slower varieties like peas (10-14 days), sunflower (10-14 days), and basil (16-21 days) take longer but are worth the wait for their unique flavors and textures.

What are the easiest microgreens for beginners?

If you're just starting out, we recommend beginning with these varieties:

  • Radish: Extremely fast, very forgiving, and germination rates are typically high. A great confidence builder.
  • Broccoli: Easy to grow, inexpensive seeds, and works well on virtually any growing medium.
  • Sunflower: Hearty, satisfying to grow, and produces visually impressive results. Great first "wow" moment.
  • Pea shoots: Hard to mess up, and the large seeds make planting straightforward.

Start with one or two varieties to learn the process before experimenting with more challenging seeds. Our free downloadable PDF guides and YouTube tutorials walk you through everything step by step.

Read our blog: Where to Start with Growing Microgreens: A Complete Beginner's Guide

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Safety & Quality

Can I use bird seed for microgreens?

Absolutely not. Bird seed is not held to food safety standards and may contain contaminants, pesticides, or pathogens unsafe for human consumption. Always purchase seeds specifically labeled for microgreens or sprouts from reputable suppliers like Trueleaf Market.

Are your growing methods food-safe for selling?

Yes, when followed properly. Our hydroponic methods using reusable grow mediums and bottom-watering reduce contamination risks compared to soil growing. Always:

  • Sanitize equipment between grows
  • Use food-grade seeds from reputable suppliers
  • Maintain proper water quality
  • Follow local health department guidelines for commercial production

How do I know if my microgreens are safe to eat?

Safe microgreens should:

  • Smell fresh (no sour or musty odors)
  • Look vibrant with no visible mold or slime
  • Come from food-grade seeds and clean growing systems
  • Be free from pests

If you see mold, smell anything off, or have any doubts—don't eat them. Prevention through proper growing practices is key.

Can I grow microgreens from seeds I already have (garden seeds, herb seeds, etc.)?

Possibly, but with important cautions. The seeds must be untreated (no fungicide coatings or chemical treatments) and from a plant species that is safe to eat at the seedling stage. Many standard garden seeds are treated with chemicals not intended for human consumption at the sprout/microgreen stage.

Your safest option is always to use seeds specifically labeled for microgreen or sprouting use from a reputable supplier. These seeds are held to food safety standards appropriate for growing crops that will be consumed young. We recommend Trueleaf Market for microgreen-specific seeds.

Never use seeds from nightshade plants (tomatoes, peppers, eggplant, potatoes), ornamental plants, or any seeds of unknown origin.

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Technical Questions

What fertilizer do you recommend?

For hydroponics, we use OceanSolution 2-0-3 at 0.5 oz per gallon. It's OMRI-listed organic, mixes cleanly, and doesn't clog systems.

For soil, we like Fox Farm Ocean Forest or Happy Frog blends, which provide nutrients without additional fertilizer.

Download our Free Fertilizer Ratio Guide

What's the best temperature for growing microgreens?

Most varieties thrive at 65-75°F (18-24°C). Cooler temperatures slow growth, while temperatures above 80°F can cause poor germination and increased disease pressure.

How often should I water microgreens?

During germination: Mist 1-2 times daily to keep medium moist.

After germination: Bottom-water as needed (usually 1-2 times daily) by adding water to reservoir tray. Medium should stay moist but not waterlogged.

Kratky systems: Check water levels every 2-3 days and refill or refresh as needed.

What's the difference between bottom-watering and top-watering?

Bottom-watering: Water is added to a reservoir tray beneath the grow tray. Roots absorb water from below. Reduces mold risk and keeps foliage dry.

Top-watering: Water applied directly to growing medium with spray bottle or watering can. Good for germination phase but can increase mold risk during growth.

We recommend bottom-watering for best results.

Can I reuse growing medium between crops?

Silicone/stainless steel reusable mediums: Yes, clean and sanitize between grows.

Coco coir: Can be reused once or twice if sterilized, but quality degrades. Most growers compost used coco coir.

Soil: Do not reuse. Compost spent soil and start fresh each time.

What grow lights do you recommend for microgreens?

For most home growers, basic full-spectrum LED shop lights work great and are very affordable. Position lights 6-12 inches above your trays and run them for 12-16 hours per day. You don't need expensive specialty grow lights for microgreens—they're not as light-demanding as flowering plants.

For small setups (1-4 trays), a 2-foot LED light works well. For larger rack systems, 4-foot LED shop lights are the standard. Look for lights rated at 6500K (daylight spectrum) for best results.

The most important thing is consistency—microgreens need adequate, consistent light to develop thick stems, vibrant colors, and full flavor. Inadequate light is the number one cause of leggy, pale, underwhelming microgreens. 

You can learn more about Microgreen Lighting here and find links to lights we suggest.

What's the best water for growing microgreens?

In order of preference:

  • Filtered water: Removes chlorine, chloramine, and sediment. A basic carbon filter works well.
  • Tap water (left to sit 24 hours): Allowing tap water to sit uncovered lets chlorine gas off. Note that this does NOT remove chloramine, which many municipalities now use instead of chlorine.
  • Tap water (direct): Works fine for many growers, depending on local water quality. If you notice poor germination, off flavors, or slow growth, water quality may be a factor.

Avoid distilled water for hydroponic growing—it lacks the trace minerals plants benefit from. If using reverse osmosis water, you'll need to add back minerals through your nutrient solution.

If you suspect water quality issues, consider getting a basic water quality test kit or contacting your local water utility for their annual water quality report.

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Shipping & Orders

Do you offer free shipping?

Yes! Free shipping on all US orders over $60.

How long does shipping take?

Orders typically ship within 1-3 business days. Delivery takes 3-7 business days depending on your location, weather, holidays and the shipping service. You'll receive a tracking number once your order ships. Once your order leaves our hands and is scanned into the shipping service, we do not personally have control over the timing or any delays.

Do you ship internationally?

Currently, we only ship within the United States and Canada.

What's your return policy?

We offer a 1-year warranty on trays, tray kits, and reusable grow mediums. If you experience any issues, contact us at info@onthegrow.net. View full return policy.

Do you offer bulk or wholesale pricing?

For bulk orders or wholesale inquiries, please email info@onthegrow.net with details about your needs. We don't typically do these types of transactions, but we might consider it.

Can I cancel or modify my order?

Contact us immediately at info@onthegrow.net if you need to modify your order. Once an order ships, we cannot make changes, but you can return items under our standard return policy.

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Business Questions

Can I sell microgreens I grow with your products?

Yes! Our products are made for both home and commercial use. Many of our customers run successful microgreens businesses using our trays and grow mediums. But always do your own research too!

Do I need special licenses to sell microgreens?

Requirements vary by state and locality. Common needs include:

  • Cottage food license or commercial kitchen access
  • Business license
  • Food handler's permit
  • Liability insurance

Check with your local health department and small business administration for specific requirements in your area.

How do I price my microgreens?

Pricing varies by region and market. Research local competitors and consider:

  • Production costs (seeds, supplies, utilities)
  • Labor time
  • Packaging
  • Delivery/market fees

Many growers charge $25-40 per pound wholesale, $35-50+ per pound at farmers markets.

Where can I learn more about starting a microgreens business?

Our Microgreen Masterclass course includes a section on business basics. Our book Becoming a Microgreen Master also covers business fundamentals.

How much does it cost to get started growing microgreens?

Basic startup (home growing):

  • Tray kit with reusable medium: $30-60
  • Seeds (first batch): $10-20
  • Grow light (optional): $20-50

Total: $60-130 to start

Commercial startup costs vary based on scale—our Masterclass covers business budgeting.

What's the cost per tray after initial setup?

With reusable systems, your ongoing costs are minimal:

  • Seeds: $1-5 per tray depending on variety
  • Fertilizer (hydroponic): ~$0.25 per tray
  • Water/electricity: ~$0.50-1 per tray

Total: $2-6 per tray. Your reusable mediums last months, so no ongoing medium costs like with disposable options.

Where can I sell microgreens?

Common sales channels for microgreens include:

  • Farmers markets: The most popular starting point for new growers. Direct customer interaction and typically the highest per-unit pricing.
  • Restaurants and chefs: Many chefs actively seek local microgreen suppliers for fresh, high-quality garnishes and ingredients. Approach local restaurants with samples.
  • Grocery stores and co-ops: Some local and specialty grocery stores will stock locally grown microgreens, especially organic and health-focused retailers.
  • Online/direct delivery: Some growers build subscription models delivering directly to customers in their area.
  • Meal kit companies: An emerging channel as meal kit services seek fresh, locally sourced ingredients.

Each channel has different pricing expectations, volume requirements, and logistics. Our Microgreen Masterclass covers business basics including sales channels and pricing strategies. But always do your own research too!

How do I find restaurant clients for my microgreens?

Start by visiting local restaurants that focus on farm-to-table, health-focused, or upscale dining. Bring fresh samples so chefs can see the quality and taste the product. Many chefs will appreciate the visual appeal and flavor intensity that fresh, locally grown microgreens bring to their dishes. Build relationships, be consistent with quality and delivery, and start small—even a few restaurant accounts can provide steady weekly revenue.

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Brand & Content Use

Can I use "On The Grow" in my business name or social media handles?

No. "On The Grow" is a registered trademark owned by On The Grow, LLC. You cannot use our brand name or any variation of it (including On-The-Grow, OnTheGrow, @YourFarm_OnTheGrow, etc.) in your business name, social media handles, marketing materials, or product listings. This includes using our name to suggest affiliation, endorsement, or partnership.

Using our trademarked name creates confusion with our customers and violates trademark law. We protect our brand to maintain trust with our community.

Can I redistribute your free PDFs or content to my customers?

No. All of our content—including free PDFs, videos, blog posts, and guides—is copyrighted material owned by On The Grow, LLC. You cannot download and redistribute our materials to your customers, even if you're not charging for them.

What you CAN do: Share links to our content! Feel free to direct your customers to our website, YouTube channel, or Facebook page where they can access our free resources directly. This helps your customers while respecting our intellectual property.

Can I use your videos or images in my marketing materials?

No. You cannot use our videos, photos, or other content in your own marketing, website, or social media without written permission. This includes screenshots from our videos, images from our website, or excerpts from our guides.

If you want to reference our content, link to it instead.

Are you hiring? Can I work for On The Grow?

We are not currently hiring. On The Grow operates as a two-person team (CJ and Mandi), and we do not have plans to expand our team at this time. We do not accept applications for employment, partnerships, or collaborations unless we publicly announce an opening.

Can I say I was "trained by On The Grow" if I took your Masterclass?

You can say you completed the Microgreen Masterclass or learned from On The Grow's educational content. However, you cannot claim to be certified, endorsed, affiliated with, or employed by On The Grow. We do not offer certifications or formal credentials.

Can I link to your content on my website or social media?

Yes! We encourage you to share links to our website, YouTube videos, Facebook page, and free resources. Linking helps your audience find valuable information while respecting our copyright and brand.

I have a question about using your brand or content that isn't answered here.

Email us at info@onthegrow.net with your specific question. Please note that we generally do not grant permission for brand name use or content redistribution.

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Purchasing Questions

I used Shop Pay Installments. Can you change my payment plan?

No. Shop Pay Installments is a financing service provided by Affirm/Shopify, not by On The Grow. We received full payment for your order and have no access to your payment plan. Contact Shop Pay support for payment plan questions.

I want to return something I bought with Shop Pay Installments. Do I still owe the payments?

We will refund Shop Pay/Affirm when we process your return (per our Return Policy). How that affects your payment plan is determined by Shop Pay/Affirm's policies. You should contact them directly to understand how returns affect your installment agreement.

Can I cancel my order to cancel my payment plan?

No. Canceling your order with us does not automatically cancel your payment agreement with Shop Pay/Affirm. We will process a refund to them if we can cancel before shipping, but you must work with Shop Pay/Affirm regarding your payment obligation.

Shop Pay denied my payment plan. Why?

Shop Pay/Affirm makes all financing decisions. We have no information about why you were denied. Contact Shop Pay customer service for questions about your application.

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Still Have Questions?

Email us: info@onthegrow.net

Watch tutorials: YouTube Channel (350+ videos)

Join our community: Follow us on Facebook and Instagram

Download free resources: Free PDF Guides