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Fully Colonized Rye Grain Spawn (Gourmet Mushrooms)
€16,90
Fully Colonized Rye Grain Spawn (Gourmet Mushrooms)
Lab-sterilized and ready to inoculate.
€16,90
Pre-sterilized under lab conditions - ready to inoculate
0.2 micron filter patch + self-healing injection port
Made fresh in small batches - never shelf stock
Weight: 500 Grams
Mushroom Species: Lion’s Mane – Lion’s Pride Commercial Strain (Hericium erinaceus)
100% sterility guaranteed - we replace it or refund you, no questions asked
100% sterility guaranteed
Free EU shipping over 99 EUR
4.8 - 300+ verified reviews
Free replacement if contaminated
Ships from Slovakia - EU delivery 2 to 6 business days
Lab-Grade Sterility
Every bag sterilized and sample-tested. Near-zero contamination risk.
Ready to Inoculate
No prep. No pressure cooker. Inject your culture and grow.
Free Mycology Support
Expert growing advice from our team - always included, always free.
2 to 6 Day EU Delivery
Fast, tracked shipping across Europe. Free above 99 EUR.
Simple process
From bag to harvest in 3 steps.
01
Inoculate
Inject your liquid culture, spores, or agar plug directly through the self-healing injection port. No flow hood or open transfers needed.
Day 102
Colonize and Shake
Keep the bag at 20 to 25°C in a dark spot. When 50% colonized, shake to break up and redistribute the mycelium for faster, even coverage.
Days 7 to 2103
Harvest and Enjoy
Once fully colonized, introduce fresh air and humidity. Pins appear within days. Harvest just before the caps fully open for the best flavour and yield.
Days 21 to 35Ingredients
Only what your mushrooms actually need.
Organic Rye Grain
Certified organic rye berry, hydrated to exact field capacity. Fastest, most even colonization. Never substituted with cheaper grain.
Premium Substrate
Precision-balanced for the right texture, moisture, and pH. Optimized for rapid pinning and multiple productive flushes.
0.2 Micron Filter Patch
Medical-grade gas exchange. CO2 out, fresh air in - blocks all contaminants, no sterile enclosure required.
Self-Healing Injection Port
Silicone port reseals after every injection. Clean inoculation without a flow hood. Designed for multiple access points without contamination risk.
Works best for
Which mushrooms can you grow?
Blue OysterBeginner friendly
Pink OysterBeginner friendly
Golden OysterBeginner friendly
Lion's ManeIntermediate
ChestnutBeginner friendly
King OysterIntermediate
ShiitakeIntermediate
About this product
Mushroom Grain Spawn Bag (Fully Colonized)
Fully Colonized Rye Grain Spawn (Gourmet Mushrooms)
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.
Beginner and Expert Friendly
Works for first-time growers and experienced cultivators. No lab, no equipment, no guesswork.
100% Sterile Guarantee
If your bag arrives contaminated, we replace it immediately - no questions, no forms, no waiting.
Certified Organic Ingredients
Precision-balanced substrate from premium organic sources. Never substituted. Always fresh.
Sealed and Batch-Tested
Sealed immediately after sterilization. Every batch is sample-tested before it ships.
Common questions
Everything you need to know.
Yes. Our All-in-One bags are designed specifically for beginners. Everything is pre-sterilized and ready - you only need to inject your liquid culture or spores through the built-in injection port. No pressure cooker, no lab, no mixing required.
A liquid culture syringe, spore syringe, or agar plug to inoculate with. That is it. The bag contains everything else - sterilized grain, substrate, filter, and injection port.
Colonization typically takes 10 to 21 days depending on species and temperature. After full colonization, pins usually appear within 5 to 10 days. Total time from inoculation to first harvest is usually 3 to 5 weeks.
Most growers get 2 to 4 flushes from a single bag. After harvesting, soak the block in cold water for 12 hours to rehydrate, then return it to fruiting conditions.
Store in a cool, dark place away from direct sunlight. Use within 90 days of the production date. Do not freeze.
We replace it completely or refund you - your choice. No forms, no questions, no waiting. Just contact us.
Customer reviews
What growers say.
Customer Reviews
Based on 15 reviews
93%
(14)
7%
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M
Very good i cannot recommend it enough
S
There was a shipping problem but the seller immediatley took cate of it. Very friendly, very helpful! Thanks!
A
My package has arrived in a good condition.
I appreciate it for sending a new batch as the old one was lost.
R
Top. Will definitely buy again.
N
Cool stuffs, recomeded! I will buy again from this seller.