Reusable Grow Medium - Size: Large Sprout Tray - 1.2mm

Growing microgreens in our Large Sprouting Trays? This silicone reusable grow medium is pre-cut to fit perfectly, giving you a clean, soil-free growing solution that lasts for months. Designed specifically for the unique dimensions of sprouting tray systems, this food-grade silicone mat minimizes the waste and mess of traditional growing mediums while delivering consistent results.

Why Choose Silicone for Sprouting Trays?

Perfect fit for sprouting systems: Pre-cut to 8" x 10" to fit our Large Sprouting Trays precisely. No trimming required—just drop it in and start growing.

Hydroponic reusable alternative: Unlike soil or coco coir that needs replacing after every harvest, this silicone mat can last for months with proper care. The 1.2mm holes provide optimal moisture retention and root aeration while reducing ongoing supply costs and waste.

Easy cleanup for tight spaces: Sprouting trays can be tricky to clean thoroughly, but the flexible silicone material makes root removal quick and effortless. Just use our Microgreen Medium Scraper, wash with warm water and free-and-clear soap, and you're ready for the next grow.

Perfect for popular varieties: Works well with Sunflower, Pea, Radish, Broccoli, Arugula, Basil, Cabbage, Kohlrabi, and most Brassica family microgreens. The reusable design maintains consistent moisture levels around roots while allowing you to add liquid nutrients directly through the mesh for enhanced growth.

Key Specifications

• Pre-Cut Dimensions: 8" x 10" – fits Large Sprouting Trays
• Hole Size: 1.2mm – great for root development and moisture retention
• Material: Food-Grade Platinum-Cured Silicone with fiberglass core for durability. 3rd party tested for FDA Compliance. LFGB Tested & Compliant.
• Flexibility: Easily customizable with household scissors if needed for custom sizing
• Lifespan: Months of continuous use with proper care and maintenance
• Silicone is rated for 20 to 30+ grow cycles per sheet with proper care

Care & Maintenance

Cleaning: After harvest, use our Microgreen Medium Scraper/Cleaning Tool to remove root residue. Wash with warm water and a free-and-clear dish soap (or another silicone-safe, food-safe soap). The flexible silicone surface makes root removal significantly easier than rigid alternatives.

Sanitization between grows: For thorough sanitation, carefully pour boiling water over the mat or submerge it for 1–2 minutes. Allow to air dry fully before reuse. Sanitize after every grow.

Time investment: 5 minutes per mat from cleanup to sanitized and ready for the next grow. Many people wash and sanitize them in batches for faster timing.

For detailed cleaning protocols and troubleshooting stains, see our complete silicone maintenance guide.

Seed Compatibility

✅ Works Well With: Sunflower, Pea, Radish, Broccoli, Kale, Cabbage, Arugula, Basil, Mustard Greens, Kohlrabi, and most Brassica varieties

⚠️ More Challenging: Amaranth, very fine Mustard seeds, and other tiny seeds may require adjustments

❌ Not Recommended: Swiss Chard, Beets, and Cilantro (these perform better in soil or coco coir)

💡 Best Without a Medium: Pea varieties with aggressive root systems often perform best directly on mesh trays without a grow medium

More Sizes Available

Using different tray sizes? We offer silicone reusable grow mediums in multiple pre-cut dimensions:

• 10x20 Size for standard full-size trays
• 10x10 Size for half-size growing
• Small Sprout Tray Size for compact sprouting setups

Browse all reusable grow medium sizes here.

Want to Try Both Materials?

Not sure if silicone is right for you? Our 10x10 Sampler Pack includes both silicone and stainless steel samples so you can test both materials in your setup before committing to larger quantities.

1-Year Warranty

All silicone mesh screens are backed by our 1-year warranty. Grow with confidence knowing you're covered.

You may find these blogs helpful:

• Which Microgreen Seeds Work on Reusable Grow Mediums?

• Silicone Reusable Microgreen Grow Medium - Complete Grow Medium Overview
  

• How to Clean and Sanitize Microgreen Trays and Reusable Grow Mediums: Complete Guide

• Microgreens and Mold: The Complete Guide to Prevention, Identification, and Treatment

• Knowing the Right Time to Transition Microgreen Trays from Weight to Blackout

• Common Mistakes When Growing Microgreens (And How to Avoid Them)

• Looking for the Best Microgreen Growing Advice? Start with On The Grow

• Frequently Asked Questions

Important Product Disclaimers

• Please review our Reusable Grow Medium Safety Disclaimer before purchasing
• Trays, seeds, and other items shown in photos are NOT included
• Silicone staining: Some seed varieties may cause natural staining on the silicone surface—this doesn't affect performance
• Fiberglass core: Replace your mat if you notice tears, deep cuts, or significant wear that could compromise the fiberglass core integrity. Learn more about replacement timing
• Not recommended for: Swiss Chard, Beets, Cilantro (these perform better in traditional soil-based methods)
• Challenging varieties: Amaranth, fine Mustard seeds, and other very small seeds may require special techniques
• NUTRITIONAL CONTENT DISCLAIMER: This product is an inert growing medium that does not add or remove nutrients from your crops. We make NO claims about nutritional content or nutrient density of microgreens grown using this product. Nutrient density depends on many factors outside our control including seed variety, water quality, light, fertilizers, and growing conditions - not the growing medium itself. We have not conducted laboratory testing and are not nutritionists. For complete nutritional disclaimer, see: [link to Safety Disclaimer page]

Sustainable, reusable growing for your sprouting tray system—clean, efficient, and built to last. 🌱