Silicone vs Stainless Steel Grow Mediums for Microgreens: Which Is Better?
Choosing between silicone and stainless steel reusable grow mediums is one of the most common questions from growers making the switch from soil. Both offer excellent long-term value, but silicone has become our go-to recommendation for most growers.
Quick Comparison
| Feature | Silicone Grow Medium | Stainless Steel Mesh |
|---|---|---|
| Durability | 18-24 months (20-30+ grows) | 200+ uses |
| Price | $15.97 per 2-pack ($8 per sheet) | Similar initial cost |
| Ease of Cleaning | Easy (soap & water, can boil) | Very easy (can boil) |
| Water Retention | Excellent capillary action | Good capillary action |
| Best For | Most growers, all experience levels | Heavy commercial use |
| Flexibility | Flexible, easy to store | Rigid |
| Sterilization | Boil or sanitize (-40°F to 450°F safe) | Boil or sanitize |
| Safety | Soft, no sharp edges | Sharp edges - handle carefully |
Silicone Reusable Grow Mediums
How They Work
A reusable grow medium is a medium that can be used multiple times for growing plants. This approach is cost-effective and environmentally friendly, greatly reducing the need for single-use grow mediums like soil or coco coir, which often come wrapped in plastic and require large quantities for each microgreen grow.
The silicone reusable grow medium acts as a lattice for plant seeds to sit on top of and eventually anchor the root structures that develop. Once through germination, the roots penetrate through the mesh holes and into the water beneath, which then waters the microgreens.
Our Silicone Grow Medium Features
Material & Safety:
- Made from virgin, food-grade silicone
- Fiberglass core for added structural strength
- BPA-free and undergoes third-party testing to ensure FDA compliance
- Temperature resistant from -40°F to 450°F (-40°C to 230°C) - safe for boiling water sterilization
Specifications:
- Hole density: 1.2mm, suitable for most microgreen seeds
- Also available in 1.7mm for larger seeds (sunflower, peas, wheatgrass, radish, melon)
- Expected lifespan: With proper care and cleaning, 18-24 months (or 20-30+ grows)
- Comes with a 1-Year Warranty on all mesh screens
- Available in pre-cut sizes: 10x20, 10x10, and sprouting tray sizes
- Sold in 2-packs and 10-packs
Advantages
✅ Excellent moisture retention - Capillary action keeps roots consistently moist
✅ Most forgiving for all skill levels - Easier watering than steel
✅ Flexible material - Easy to roll up for storage
✅ Lower initial cost - $7.99 per sheet
✅ Soft on delicate roots - Gentler than rigid metal
✅ Safe to handle - No sharp edges
✅ Food-safe - FDA-compliant, food-grade silicone
✅ Heat resistant - Can be boiled for complete sterilization
✅ Warranty protected - 1-year warranty coverage
Disadvantages
❌ Shorter lifespan - 20-30 grows vs 200+ for steel
❌ Can tear - Sharp objects or rough handling can damage
❌ Hand wash recommended - While heat-safe, hand washing is gentler
❌ May stain - Can discolor over time with certain seeds like alfalfa (cosmetic only)
Best For
- Home growers - Most growers benefit from silicone's ease of use
- Beginners - More forgiving moisture retention
- All experience levels - From first-time growers to experienced cultivators
- Varieties needing consistent moisture - Excels with brassicas
- Those wanting lower upfront investment - Affordable entry point
- Safety-conscious growers - No sharp edges to worry about
Cost Over Time
- Initial: $7.99 per medium (2-pack for $15.97)
- Lifespan: 20-30 uses average (18-24 months with proper care)
- Cost per grow: $0.27-$0.40
- Warranty: 1-year coverage for defects
Stainless Steel Mesh Grow Systems
How They Work
Fine stainless steel mesh allows roots to grow through while seeds rest on top. Mesh sits above a water reservoir. Works similarly to silicone mats.
Our Stainless Steel Features
- Material: 316-grade stainless steel (superior corrosion resistance)
- Mesh density: 1mm, prevents most microgreen seeds from slipping through
- Durability: Designed to withstand hundreds of growing cycles
- Temperature resistant: Can be boiled for sterilization
- Recyclable: Fully recyclable at end of life
- Available sizes: 10x20, 10x10, and sprouting tray sizes
Advantages
✅ Extremely durable - 200+ uses possible
✅ Can be boiled - Complete sterilization
✅ Professional grade - Used by commercial operations
✅ Highest long-term value - Lowest cost per grow over time
✅ No staining - Always looks clean
✅ Fully recyclable - Sustainable end-of-life
Disadvantages
❌ Requires more attention to watering - Less forgiving than silicone
❌ Rigid - Doesn't fold, takes up more storage space
❌ Seeds can fall through - Fine seeds may slip through 1mm mesh
❌ Steeper learning curve - Takes practice to master watering
❌ Sharp edges - Can penetrate skin, requires careful handling
❌ Less moisture retention - Can dry out faster if not monitored
Best For
- Commercial operations with high volume
- Long-term serious growers comfortable with learning curve
- High-volume production (20+ trays)
- Maximum sustainability goals
- Growers who have mastered watering techniques
Cost Over Time
- Initial: Similar to silicone
- Lifespan: 200+ uses
- Cost per grow: $0.15 (lowest long-term)
Side-by-Side Growing Comparison
Germination Phase (Days 1-4)
Silicone: Retains moisture excellently during blackout. Less frequent checking needed. Seeds stay in place.
Stainless Steel: May need more frequent moisture checks. Seeds can shift if mesh is bumped.
Winner: Silicone (more forgiving)
Growth Phase (Days 5-10)
Silicone: Capillary action provides consistent moisture. Very easy bottom watering. Forgiving if you miss a watering.
Stainless Steel: Need to ensure water level is correct. Can dry faster if water level drops. Requires more attention.
Winner: Silicone (easier maintenance)
Harvest
Silicone: Roots grow through mesh. Very clean harvest. Easy to remove greens. May need to gently peel some roots.
Stainless Steel: Roots grow through mesh. Very clean harvest. May need to peel some roots. Be careful of sharp edges.
Winner: Silicone (safer, equally clean)
Cleaning
Silicone: Hand wash with soap and hot water. Sanitize with bleach or H2O2. Can boil safely. Takes 5-10 minutes.
Stainless Steel: Hand wash or boil. Can use more aggressive cleaning. Takes 5-10 minutes.
Winner: Tie (both easy to clean)
Longevity
Silicone: Will show wear after 20-30 grows (18-24 months). Still functional but may develop small tears. 1-year warranty.
Stainless Steel: Shows virtually no wear. Looks the same after 200 grows. Can last indefinitely.
Winner: Stainless Steel (much longer lifespan)
Which Varieties Grow Better on Each?
Silicone Excels With:
- Broccoli
- Kale
- Radish
- Mustard
- Arugula
- Cabbage
- All brassicas
- Basil
- Most microgreen varieties
Stainless Steel Excels With:
- All of the above
- Varieties with heavy root systems
- Longer-growing varieties
- High-volume commercial production
Bottom Line: Both work excellently for most varieties. Silicone is easier for beginners and forgiving on moisture. Steel excels in ultra-high-volume commercial settings.
Cost Analysis: Break-Even Point
Scenario 1: Home Grower (1 tray/week, 50 trays/year)
Silicone:
- Initial: $7.99
- Year 1: $7.99
- Lasts approximately 6 months with weekly use
- Total for 25 grows: $7.99
- Cost per grow: $0.32
Stainless Steel:
- Initial: Similar
- Year 1-4+: Same medium
- Total 200 grows: Similar initial investment
- Cost per grow: ~$0.15 (if used to full lifespan)
Winner: Silicone offers best value for typical home growers. Steel only wins if you use it hundreds of times.
Scenario 2: Casual Grower (2-3 trays/month)
Silicone:
- Lasts 18-24 months easily
- Perfect for this usage level
- $7.99 investment for nearly 2 years
Winner: Silicone is ideal - you'll get excellent lifespan at this pace
Scenario 3: Heavy Commercial (10+ trays/week, 500+ grows/year)
Silicone (need frequent replacements):
- Will need to replace every 20-30 grows
- 10 mediums rotating: $79.90 initial
- Replacement costs add up with heavy use
Stainless Steel:
- Initial: Similar
- Virtually no replacement costs
- Pays off at very high volume
Winner: Stainless steel makes sense for heavy commercial operations
Our Recommendation Based on Your Growing Level
New to Reusable Mediums?
Start with Silicone
- More forgiving moisture retention
- No sharp edges to worry about
- Lower initial investment
- Easier to learn proper watering
- Comes with 1-year warranty
Home Grower (1-10 trays/week)?
Choose Silicone
- Perfect for this scale
- Excellent value at your volume
- Lasts 18-24 months with care
- Makes growing easier and more enjoyable
Serious Hobbyist/Small Commercial?
Start with Silicone, Add Steel If Needed
- Begin with silicone to learn the system
- Add stainless steel for your highest-volume varieties
- Best of both worlds approach
Large Commercial (20+ trays/week)?
Consider Stainless Steel
- Makes economic sense at very high volume
- Requires mastery of watering techniques
- Lowest long-term cost per grow
- Handle with care due to sharp edges
Environmental Impact
Silicone:
- Recyclable (check local programs)
- Lifespan: 20-30 grows before disposal
- Replaces 20-30 bags of soil/coir
- Made from food-grade, BPA-free materials
- FDA-compliant and third-party tested
Stainless Steel:
- Fully recyclable metal
- Lifespan: 200+ grows (potentially indefinite)
- Replaces 200+ bags of soil/coir
- 316-grade steel - superior corrosion resistance
Winner: Both are vastly better than disposables. Steel wins for longest lifespan.
Maintenance Requirements
Silicone:
- Wash after each use: 5-10 minutes
- Can boil for sterilization (2-3 minutes)
- Deep clean with baking soda paste as needed
- Or use hydrogen peroxide solution soak
- Inspect for tears: 2 minutes
- Total time over 25 grows: ~4-5 hours
Stainless Steel:
- Wash after each use: 5-10 minutes
- Can boil for sterilization
- Inspect for damage: 1 minute
- Total time over 200 grows: ~20 hours
Both are very easy to maintain. Silicone takes slightly less total time per grow cycle.
Making Your Decision
Choose Silicone If:
✅ You're starting with reusable systems
✅ You want the most forgiving growing experience
✅ You prefer easy handling with no sharp edges
✅ You're growing 1-20 trays per week
✅ You value flexibility and easy storage
✅ You want FDA-compliant, BPA-free materials
✅ You appreciate warranty protection
✅ You want the best value for home growing
Choose Stainless Steel If:
✅ You're running heavy commercial production (20+ trays/week)
✅ You've mastered watering techniques
✅ You want the absolute lowest cost per grow at high volume
✅ You're comfortable handling sharp edges carefully
✅ You want maximum durability
✅ You plan to grow for many years at high volume
Choose Both If:
✅ You want to test both methods
✅ You're transitioning to commercial
✅ You grow multiple varieties with different needs
✅ You want backup systems
Frequently Asked Questions
Q: Can I start with silicone and add steel later?
Yes! Many growers start with silicone to learn the system, then add stainless steel for specific high-volume varieties. Your silicone mediums remain useful for testing or lower-volume crops.
Q: Which one gives better yields?
No significant difference when used properly. Yield depends more on variety, seed quality, and growing technique than the medium.
Q: How long will silicone really last?
With proper care and cleaning, expect 18-24 months or 20-30+ grows. Heavy commercial use may require more frequent replacement.
Q: Can silicone mediums be repaired if they tear?
Minor tears can sometimes work with careful placement, but we recommend replacement for best results. They're covered under 1-year warranty for manufacturing defects.
Q: Does one grow faster than the other?
No difference in growth speed. Both provide adequate moisture and support for normal growth rates.
Q: Can I really boil the silicone?
Yes! Our silicone is temperature resistant from -40°F to 450°F, so boiling water sterilization is perfectly safe.
Q: Do the seeds work the same on both?
Most varieties work on both. Very fine seeds like amaranth and sorrel may fall through either mesh. Refer to our seed compatibility lists in each product description.
Q: Are these dishwasher safe?
While both can handle heat, we recommend hand washing for longest lifespan.
Hybrid Approach: Best of Both Worlds
Many growers use both:
Silicone for:
- Daily production
- Testing new varieties
- Varieties you grow occasionally
- Teaching and learning
Stainless Steel for:
- Highest-volume varieties (if commercial)
- Ultra-long-term operations
- Maximum cost efficiency at scale
This approach lets you start affordable with silicone while building toward steel if your operation scales up dramatically.
Our Recommendation
For 95% of growers: Start with Silicone
It's more forgiving, easier to handle, safer with no sharp edges, and offers excellent value. The moisture retention makes it easier to succeed, especially when learning reusable growing techniques.
For the top 5% (heavy commercial): Consider Stainless Steel
If you're running 20+ trays per week consistently, the durability and long-term cost savings of steel make sense—but only if you've mastered watering techniques.
For maximum flexibility: Start with one silicone 2-pack
Test the method with a small investment ($15.97), then add more silicone or try steel based on your experience.
Where to Buy
Both silicone and stainless steel reusable grow mediums are available in multiple sizes:
Silicone Options:
- 10x20 size: 2-pack ($15.97) or 10-pack
- 10x10 size: 2-pack or 10-pack
- 1.7mm large-hole version for bigger seeds
- Sprouting tray sizes
Stainless Steel Options:
- 10x20 size: 2-pack or 10-pack
- 10x10 size: 2-pack or 10-pack
- Sprouting tray sizes
Try Both:
- 10x10 Sampler Pack with both silicone and steel
Browse our complete selection of reusable growing mediums →
Bottom Line
Both silicone and stainless steel dramatically outperform disposable options like soil or coconut coir in long-term cost and sustainability.
For most growers, silicone is the clear winner: easier to use, more forgiving, safer to handle, and excellent value. It's our primary recommendation and what we use ourselves.
Stainless steel excels in one scenario: heavy commercial production where you're growing 20+ trays weekly and need the lowest possible cost per grow at very high volume.
You can't go wrong with either—but if you're just starting or growing at home/small commercial scale, silicone will serve you better.