Blue Oyster is the culture we point beginners to first. It grows fast, shrugs off small mistakes and fruits in cooler rooms where many oysters stall. This plate holds a first-generation isolate of Pleurotus ostreatus var. columbinus, grown out on malt extract agar and ready to transfer.
- P. ostreatusSpecies
- 7–10 daysTo cover a plate
- 45–65°FFruiting temp
- BeginnerSkill level
- 8–10Plates from one
Why start with our Blue Oyster plate
Speed on your side
The mycelium runs so quickly that it tends to outgrow contaminants, which gives you margin while you're learning transfers.
Cool-room fruiter
Fruits anywhere from 45 to 65°F, a good fit for basements, garages and fall or winter grows.
Color you can steer
Caps come in deep blue-gray when it's cool and fade toward gray-tan as temperatures rise.
Where one plate can take you
1Grain jars or bags
Cut a wedge about the size of a pencil eraser for each quart jar or bag of sterilized grain. Expect full colonization in about 10–14 days.
2Liquid culture
Drop a small wedge into sterilized broth to grow a liquid culture you can draw syringes from.
3More plates
Slice the culture and transfer the pieces to fresh agar. One plate typically yields 8–10 new plates for a backup library.
4Pick the best
Choose the fastest, cleanest-looking growth and carry only that section forward to keep the line strong.
Blue Oyster plate specs
| Spec | Detail |
|---|
| Scientific name | Pleurotus ostreatus var. columbinus |
| Genetics | First-generation isolate from our master culture |
| Medium | Malt extract agar (MEA), about 18 mL |
| Dish | 90mm polypropylene, sealed with Parafilm |
| Mycelium appearance | Bright white, fast, ropey (rhizomorphic) |
| Time to cover agar | 7–10 days at 70–75°F |
| Time to colonize grain | 10–14 days |
| Fruiting temperature | 45–65°F |
| Fruiting substrates | Straw, hardwood sawdust, supplemented hardwood pellets, Master's Mix |
| Skill level | Beginner |
| Storage (sealed) | 60–90 days at 55–70°F in the dark; 6–9 months refrigerated at 35–40°F |
| Ships | Within 1 business day by USPS Priority Mail |
Common questions
Is Blue Oyster a good first agar culture?
Yes. Its fast, ropey growth is easy to judge on amber agar, and it's forgiving when a transfer isn't perfect.
What does Blue Oyster fruit on?
Straw, hardwood sawdust, supplemented hardwood pellets and Master's Mix all work well.
How long can I keep the plate before using it?
Left sealed and stored somewhere dark at 55–70°F, it stays viable for 60–90 days. In the fridge at 35–40°F it holds for 6–9 months.
What if my plate arrives contaminated?
Every plate is inspected before it ships. If you see green or black fuzz, a pink or orange sheen, wet spreading patches or a sour smell, email us a photo within 5 days of delivery and we'll replace it free.
Made in our lab, shipped fast
We pour each plate with about 18 mL of agar, inoculate it in front of HEPA-filtered laminar flow, seal it with Parafilm and grow it out in a dedicated clean room. It's 90mm, using a polypropylene dish that flexes instead of cracking, so a bump in transit won't split the plate and break the seal. Every plate gets a visual check before packing, and anything questionable is discarded instead of shipped. Most plates show 90–100% coverage when they ship.
Because we keep colonized plates in stock instead of starting them when you order, yours usually leaves the lab within one business day. Plates travel by USPS Priority Mail, typically 2–4 days, in insulated, padded packaging, with a free cold pack from May through September and for hot-climate addresses. Orders with several items can take an extra 1–2 business days.
Blue Oyster, plate to harvest
A fully colonized plate
When it arrives: Look it over within 24 hours. A little condensation on the lid is normal. Keep it sealed, cool and dark at 55–70°F until you're ready to work.