Mushroom Grain Spawn Bag (Fully Colonized)

Ready-to-use spawn for inoculating hardwood substrates, logs & garden beds.
Clean, reliable starts for gourmet grows.

Bring your mushroom projects to life with Freshrooms Fully Colonized Grain Spawn - vigorous mycelium grown on premium grain for consistent, dependable results. It’s the go-to choice for beginners and experienced growers who want a clean start without the guesswork.

This grain spawn is designed to be mixed into the right grow material for your chosen species. While substrate choice depends on the mushroom type, all species we currently offer are hardwood-loving varieties - making our Freshrooms Hardwood Substrate, hardwood logs, hardwood chips, and outdoor mushroom garden beds the best fit.

Rye Grain Spawn (Premium Rye-Based Grain)

Our spawn is prepared on high-quality rye grain, chosen for strong, even colonization and reliable performance when spawning to hardwood-based grows. 

Why You’ll Love It:
✅ Fully Colonized & Ready to Mix - Skip the waiting and go straight to spawning your substrate.
✅ Premium Rye Grain - Strong, even colonization for a dependable start.
✅ Lab-Grade Cleanliness - Prepared under strict, lab-grade controls for consistent, reliable performance.
✅ Pre-Colonized to Your Selection - Choose from our range of species and receive fully colonized grain spawn, ready for spawning to your grow material.

Start Strong. Grow With Confidence.
Freshrooms Grain Spawn is made for a clean workflow and reliable performance - so you spend less time troubleshooting and more time growing. Pair it with our Freshrooms Hardwood Substrate for an easy, proven setup.

🛒 Order your Freshrooms Mushroom Grain Spawn Bag today and kick off your next grow with confidence.