Golden Oyster Colonized Agar Plate
Golden Oyster Colonized Agar Plate is backordered and will ship as soon as it is back in stock.
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Golden Oyster Colonized Agar Plate
Description
Description
Fully colonized Golden Oyster (Pleurotus citrinopileatus) agar plate, grown from our master culture and 1st-generation isolated genetics — the same vigorous strain we use in our Golden Oyster liquid culture syringes and grow kits. Each plate is produced fresh at our Illinois lab on standard malt extract agar (MEA), fully colonized before it ships, and ready to ship from inventory — usually within 1 business day.
Unlike most agar plate sellers who make plates to order with 2–4 week lead times, our plates are colonized and held in inventory — ready to ship from our Illinois lab. Most orders ship within 1 business day; multi-item orders may take an additional 1–2 days to process.
Why Golden Oyster on Agar?
Golden Oyster — also known as Yellow Oyster, Chestnut Oyster, or by its Chinese name "tamogitake" — is one of the most visually striking gourmet mushrooms in cultivation. The mature fruit bodies form dense clusters of bright canary-yellow caps that look like a bouquet of flowers, making them one of the most photographed mushrooms in home cultivation. Beyond the looks, Golden Oyster offers:
- Warm-weather fruiting — like Pink Oyster, Golden Oyster fruits well in summer temperatures (65–80°F) when most oysters won't, making it ideal for warm-climate or summer-season cultivation
- Fast colonization — aggressive mycelium that outpaces most contamination, beginner-friendly even for first-time agar workers
- Distinctive flavor — described variously as nutty, cashew-like, or having a savory umami quality with a slight wine-like undertone. Cooks differently from other oysters — best in dry, high-heat preparations like roasting or pan-frying.
- Dense cluster yields — Golden Oyster fruits in tight bouquets rather than individual caps, which can produce impressive harvests per block
It's also one of the few cultivated mushrooms whose appearance alone can sell it at a farmers market — the yellow color is unmistakable and stands out among the brown and white mushrooms typically on offer.
Shatterproof Polypropylene Plates
Every Golden Oyster plate ships in a 90mm polypropylene Petri dish — not the standard polystyrene used by most agar sellers. Polypropylene flexes under impact instead of cracking, which means your plate arrives intact even after rough handling in transit. This is a meaningful upgrade: a cracked plate isn't just a damaged product, it's a contamination risk, since a crack breaks the parafilm seal and exposes the culture to airborne contaminants. We chose polypropylene specifically to eliminate that problem.
(The exception in our lineup is Lion's Mane, which uses clear polystyrene to maximize contrast against our specialty black agar.)
What You'll Receive
- One 90mm polypropylene Petri dish, parafilm-sealed for sterility during transit
- ~18mL malt extract agar (MEA) — our standard formulation for gourmet species
- Fully colonized with healthy, white-to-yellowish Golden Oyster mycelium (typically 90–100% coverage at ship time)
- 1st-generation isolated genetics from our master culture — the same strain in our Golden Oyster LC syringes and grow kits
- Lab-inspected for contamination before ship
- Produced fresh at Myco Labs (Illinois, USA)
How to Use Your Agar Plate
A single colonized agar plate is one of the most versatile tools in mushroom cultivation. From one plate, you can:
- Transfer to grain — cut a small wedge of colonized agar and place it onto sterilized grain (rye, our 5-grain blend, etc.) to create grain spawn. Golden Oyster colonizes grain in 7–12 days under warm conditions.
- Create liquid culture — transfer agar wedges into sterile liquid media to produce your own LC syringes
- Expand to more plates — Golden Oyster's aggressive growth makes it ideal for dividing one plate into 8–10 fresh plates for a long-term genetic library
- Isolate strong sectors — pick the most vigorous growth and transfer it to a fresh plate to refine your genetics over generations
New to agar work? See our grain transfer tutorial.
Golden Oyster Growing Characteristics
| Latin name | Pleurotus citrinopileatus |
| Common names | Golden Oyster, Yellow Oyster, Chestnut Oyster, Tamogitake |
| Mycelium appearance | White-to-yellowish, aggressive, fluffy with rhizomorphic edges |
| Colonization speed on agar | Fast — typically 5–8 days at 75–80°F |
| Preferred grain | Rye, our 5-grain blend, or supplemented hardwood |
| Fruiting substrate | Straw, hardwood sawdust, supplemented hardwood pellets, masters mix |
| Fruiting temperature | 65–80°F (warm-weather fruiter — similar to Pink Oyster) |
| Cap color | Bright canary-yellow to golden, fading to pale yellow as fruit matures |
| Fruiting habit | Dense clusters / bouquets rather than individual caps |
| Flavor profile | Nutty, cashew-like, slightly wine-like; best in dry high-heat cooking |
| Shelf life | Short — Golden Oyster has the shortest fresh shelf life of common oysters (2–4 days refrigerated) |
| Difficulty | Beginner-friendly — among the easiest gourmet species to fruit |
| Use category | Gourmet (culinary) — especially valued at farmers markets for visual impact |
Plate Specifications
| Plate size | 90mm Petri dish |
| Plate material | Polypropylene — shatterproof, flexes under impact |
| Agar type | Standard malt extract agar (MEA) |
| Agar volume | ~18mL |
| Seal | Parafilm M, lab-grade |
| Sterility | Poured and inoculated under HEPA-filtered laminar flow |
Sterility & Quality Standards
Every plate is poured, inoculated, and inspected at Myco Labs under HEPA-filtered laminar flow. Plates are sealed with parafilm immediately after inoculation and incubated in a dedicated clean room until fully colonized. Each plate is visually inspected for contamination before being approved for shipment — if it doesn't look right, it doesn't ship.
Shipping & Handling
All agar plates are produced ahead of time and held in inventory — they are not made-to-order. Most orders ship within 1 business day of being placed. Multi-item orders (especially those including grow kits, grain spawn, or other made-fresh products) may take 1–2 additional business days to process so we can pack everything together. Orders placed Friday afternoon, weekends, or holidays ship the next business day.
Plates ship in insulated, padded packaging via USPS Priority Mail (typically 2–4 days in transit). In summer months (May–September) or to hot-climate destinations, we include a cold pack at no additional cost. Inspect your plate within 24 hours of arrival — minor condensation on the lid is normal and harmless. Store in a cool, dark place (55–70°F) until ready to use; an unopened, sealed plate stays viable for 60–90 days at room temperature, or 6–12 months refrigerated at 35–40°F.
Recommended Companion Products
- Golden Oyster Liquid Culture Syringe — same genetics, ready-to-inject format
- Grain Spawn Bags — for transferring your colonized agar to bulk
- Browse All Colonized Agar Plates
Frequently Asked Questions
What's the difference between Golden Oyster, Yellow Oyster, and Chestnut Oyster?
They're all the same species — Pleurotus citrinopileatus. "Golden Oyster" and "Yellow Oyster" are the two most common English names and are used interchangeably. "Chestnut Oyster" is a less common name some growers use. In Japanese cuisine, it's known as "tamogitake." If you see any of these names on culture listings or in grow guides, they all refer to the same mushroom.
How does Golden Oyster compare to Blue Oyster and Pink Oyster?
All three are Pleurotus species with similar cultivation requirements but distinct profiles. Blue Oyster is the cold-weather specialist (45–65°F fruiting) with classic mild oyster flavor. Pink Oyster is warm-weather (65–80°F) with a bacon-like flavor when crisped. Golden Oyster is also warm-weather (65–80°F) with a nutty, cashew-like flavor and the most visually striking appearance — bright yellow clusters that command premium prices at farmers markets. If you're picking one for summer cultivation, choose between Pink and Golden based on flavor preference. If you want to grow year-round across a wide temperature range, all three together give you complete seasonal coverage.
Is Golden Oyster a good species for selling at farmers markets?
Yes — Golden Oyster is one of the most market-friendly gourmet mushrooms. The bright yellow color makes it visually distinct from the brown and white mushrooms typically on display, which dramatically increases shopper attention. The dense cluster fruiting habit means each "bouquet" looks substantial and photogenic. The main caveat is shelf life: Golden Oyster has the shortest fresh shelf life of common gourmet species (2–4 days refrigerated), so it's best sold within 24–48 hours of harvest. Many small farmers harvest Friday morning for Saturday market.
How fast do these ship compared to other agar plate sellers?
Most orders ship within 1 business day. Compare that to other agar plate sellers (including the larger names in the industry) who make plates to order, meaning you wait 2–4 weeks after ordering for the plate to be poured, inoculated, and colonized. Ours are produced on a rolling schedule and held in inventory fully colonized, ready to ship the moment you order. Multi-item orders may take an additional 1–2 business days to process so we can pack everything together.
Why do you use polypropylene plates instead of polystyrene?
Polypropylene plates flex under impact instead of cracking. A cracked plate isn't just damaged — it's a contamination risk, since the crack breaks the parafilm seal and exposes the culture to airborne contaminants. Polypropylene eliminates that problem entirely. The plates cost us more, but the result is that your culture arrives intact and uncontaminated. (Our Lion's Mane plates are the one exception — those use clear polystyrene to maximize visual contrast against our specialty black agar.)
Are these the same genetics as your liquid culture syringes and grow kits?
Yes. Every agar plate is grown from our master culture and 1st-generation isolated Golden Oyster strain — the same genetics in our LC syringes and grow kits. Lab-tested, commercial-grade, and refined over multiple generations for vigor and yield.
How long will the plate stay viable?
An unopened, parafilm-sealed plate stored at 55–70°F in a dark place stays viable for 60–90 days. For longer storage, transfer the culture to a refrigerated plate at 35–40°F, where it can stay viable for 6–12 months. Note: like Pink Oyster, Golden Oyster is somewhat more sensitive to cold than Blue Oyster — extended refrigeration can slow recovery time. If you're storing long-term, consider keeping plates at the warmer end (40°F) and refreshing every 4–6 months.
Can I use this plate to make grain spawn directly?
Yes — that's one of the most common uses. Under a still-air box or laminar flow hood, cut a small wedge (about the size of a pencil eraser) from the colonized plate and drop it into a sterilized grain spawn bag or jar. Golden Oyster typically colonizes grain in 7–12 days at room temperature — one of the fastest gourmet species, similar to Pink Oyster.
How should I cook Golden Oyster mushrooms?
Golden Oyster cooks differently from other oysters — it benefits from dry, high-heat preparations rather than the moist sauté most oysters prefer. The cell walls hold less water, so when seared or roasted, they develop a crisp exterior and concentrate the nutty, cashew-like flavor. Recommended methods: pan-fry in a hot dry skillet until edges crisp; roast at 425°F until golden; or briefly stir-fry with high heat. Avoid long simmering or braising, which makes the texture mushy and dilutes the distinctive flavor.
What if my plate arrives contaminated or damaged?
We guarantee every plate ships in clean, fully colonized condition. If you receive a contaminated or damaged plate, contact us within 5 days of delivery with a photo and we'll replace it free of charge.
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Let customers speak for us
Fast and easy colonization! These grain jars showed growth after just 10 days. My previous efforts with the all-in-one bags are taking MUCH longer but also working. Thank you Midwest Grow Kits 🙏
I love the people and the products. The people at MWGK clearly care about the integrity of the community they serve.
The monotub works amazing only had it a couple of weeks and about to have second harvest I used AIO grow bag for first flush and move to tub for second and its great not having to watch 24/7. Thanks Midwest
Four days after mixing grain, Select substrate, and the Midwest horse manure booster - the results speak for themselves.
It has everything you need for a fast, large flush success with fewer moving parts than a standard monotub. It is a surprisingly versatile option for more advanced students. Pic is 5 grain jar at 8 days. GT LM This is where I shop, now.
Rich, perfectly field-wet, sterile and it is perfect for those many varieties that won’t thrive quite as well in Bulk Substrate and Casing Mix, which I’ve seen as best for psilocybes/cyanescens. I’m using it for the first time with Lions Mane and King Trumpets. So far so good, 7 days and primordial and pins are starting to flourish. It drains better and is lighter than MGK’s Bulk Casing and Substrate. Great product.
Love the heater and how even and exact it heats. I set mine to 76 degrees and my room fluctuates from 64-75 and it holds solid at 75 degrees. I used a probe thermometer to double check the substrate level temp and its exactly 1 degree less than the heater setting. Another tip, I only needed to use the round monotub thermometer to check my humidity levels every so often. I would leave a filter disk on that hole instead of the thermometer. The only time it came in handy was after my first flush when humidity started to drop. I was able to use that gauge and check whether I needed to mist. Overall great kit and worth the money!
Ive bought mutiple jars before i came up with my own recipe, every jar produced healthy cultures, even if ones damaged in shipping they replace immediately, highly recommend
Very small chance that you get a contaminate you already had it and you’re either culture spores etc. their stuff is 100% sterile every time 100% of the time everything is viable never had a problem been shopping with them for sometime
It’s very good product and I highly recommend it to everyone.👏👏👏
I love my magnetic stir plate it works great for Liquid culture jars.
My bag had a slow start, but excellent finish. Oak Ridge.
Great product for my cannabis best deal around arrived fast thank you Midwest grow kits definitely will be purchasing again
So far it seems very sturdy and I will give another review after I fill her up. Im just getting started with this life changing hobby and this will hold up strong
It was a price commitment, however it equated to less than I would spend on most any DIY project. I decided to purchase it and have since done spore work, agar transfers to agar and grain, culture to spawn bag inoculations, cloming and prints all with a 0% contamination rate. I practice about as good a sterile technique as I can mustard, considering I perform all my work on my kitchen table. Im consistently amazed by how flawless everything has turned out since adding this to my operations. I consider it indispensable. Instead of the double sided tape provided, i purchased some plastic velcro tape from the Gnome Depot and use it to affix the pvc guards to the sides. When i am done, i have also made it so i can sandwich them together and store them one the front to protect that precious filter when not in use. If you can swing it, buy it. Takes the risk out of procedure. Im bummed i cheaped out on the stainless riser offered at a discount with purchase of the LFH. That would have been exceedingly useful, but I have since utilized a baking drying rack to much success. Now go forth and frolic in the dung!
