King Oyster Agar Culture 90mm €19,90
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Mushroom Agar Culture Dish – 90mm Mother Culture of Gourmet & Medicinal Mushrooms My Store

King Oyster Agar Culture 90mm

Lab-sterilized and ready to inoculate.
€19,90
Made fresh to order - ships within 3-5 business days
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
100% sterility guaranteed - we replace it or refund you, no questions asked
Add €99 more for free EU shipping
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 1
02

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 21
03

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 35
Ingredients

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.
About this product

King Oyster Agar Culture 90mm

A fully colonized 90mm agar plate containing a direct clone of our Pleurotus eryngii mother culture - the same King Oyster genetics we use in our own mushroom farm production at Freshrooms.

Why Freshrooms Agar Cultures

This is not an isolated wild culture. Every plate is a direct clone of our in-house mother culture, maintained and tested for purity on a continuous basis. What you receive is the exact genetics we rely on to grow mushrooms on our own farm.

About King Oyster

King Oyster is prized for its thick, meaty stem and firm texture - one of the most versatile gourmet mushrooms for cooking. It colonizes steadily and produces impressive, long-lasting fruiting bodies with excellent shelf life after harvest.

How to Use This Plate

Option 1 - Expand on agar: Transfer a wedge to a fresh MYA Agar Plate to multiply your culture or isolate sectors.

Option 2 - Create liquid culture: Use the plate to inoculate a liquid culture syringe for faster grain colonization at scale.

Option 3 - Inoculate grain spawn: Transfer directly to our Sterile Grain Bag with Injection Port to create your own grain spawn.

What is Included

  • 1x 90mm fully colonized agar plate
  • Sealed and parafilmed for transport

Storage

Store in the refrigerator at 2 - 6 degrees C. Use within 3 months of production date.

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.