Chestnut Mushroom Colonized Agar Plate
Chestnut Mushroom Colonized Agar Plate is backordered and will ship as soon as it is back in stock.
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Description
Description
A fully colonized Chestnut mushroom (Pholiota adiposa) agar plate, grown from our master culture and 1st-generation isolated genetics maintained at our Illinois lab.
Each plate is produced on standard malt extract agar (MEA), fully colonized before it ships, and held in inventory rather than made to order, so it ships within 1 business day. Multi-item orders may take an additional 1–2 business days so we can pack everything together.
- 90mmPolypropylene dish
- ~18mLMEA agar
- 10–16 daysColonizes agar
- 55–65°FFruiting temp
- 1 dayShips within
Why growers pick Chestnut
The Chestnut mushroom is a wood-loving gourmet species that grows in dense clusters of glossy, orange-brown caps on long, pale stems. Young caps carry a slightly sticky sheen and small scattered scales, giving each cluster a polished look. It's a staple in European and East Asian markets but still uncommon in the U.S.
- Texture that holds up – firm and slightly crunchy, staying intact in stir-fries, soups, and ramen instead of turning soft
- Nutty, earthy flavor – richer than most oysters, with a mild peppery finish
- Good shelf life – around 5–7 days refrigerated, noticeably longer than the warm-weather oysters
- Standout market appeal – glossy chestnut-brown clusters look nothing like the oysters and shiitake on most market tables
Chestnut is slower to colonize than the oysters and wants a supplemented hardwood substrate, so it's best suited to growers with a few grows under their belt — and a clean, vigorous starting culture makes a real difference.
What's included
- 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 Chestnut mycelium (typically 90–100% coverage at ship time)
- 1st-generation isolated genetics from our master culture
- Lab-inspected for contamination before it ships
When your plate arrives
- Inspect it within 24 hours. Minor condensation on the lid is normal and harmless.
- Store it cool and dark. Keep the sealed plate at 55–70°F until you're ready to use it.
- Work clean. Open the plate only under a still-air box or laminar flow hood.
- Make your transfer. Cut a small wedge, about the size of a pencil eraser, and move it to grain, liquid media, or fresh agar.
Shipping and storage: plates ship in insulated, padded packaging via USPS Priority Mail (typically 2–4 days in transit), with a cold pack included at no additional cost in summer months (May–September) or to hot-climate destinations. A sealed plate stays viable for 60–90 days at 55–70°F, or 6–9 months refrigerated at 35–40°F.
What you can do with one plate
- Transfer to grain – place a wedge onto sterilized grain (rye, our 5-grain blend, etc.); Chestnut typically colonizes grain in 14–21 days
- Make liquid culture – drop agar wedges into sterile liquid media to produce your own LC
- Expand to more plates – divide one plate into 8–10 fresh plates to start a long-term genetic library
- Isolate strong sectors – move the most vigorous growth to a fresh plate to refine your genetics over generations
Shatterproof polypropylene plates
Every Chestnut plate ships in a 90mm polypropylene Petri dish rather than the standard polystyrene. Polypropylene flexes under impact instead of cracking — and a cracked plate isn't just damaged, it's a contamination risk, since the crack breaks the parafilm seal. Our Lion's Mane plate is the one exception: it uses clear polystyrene for contrast against black agar.
Specifications
| Specification | Detail |
|---|---|
| Species | Pholiota adiposa (Chestnut mushroom, Fat Pholiota) |
| Genetics | 1st-generation isolate from our master culture |
| Plate | 90mm polypropylene Petri dish, parafilm-sealed |
| Agar | ~18mL standard malt extract agar (MEA) |
| Sterility | Poured and inoculated under HEPA-filtered laminar flow |
| Mycelium appearance | White and dense, aging to cream or pale yellow-tan |
| Colonization speed on agar | Moderate to slow — typically 10–16 days at 70–75°F |
| Preferred grain | Rye or our 5-grain blend |
| Fruiting substrate | Supplemented hardwood sawdust or masters mix — not suited to straw |
| Fruiting temperature | 55–65°F |
| Cap color | Glossy orange-brown to chestnut, slightly sticky when young, with small scattered scales |
| Fresh shelf life | Good — about 5–7 days refrigerated |
| Difficulty | Intermediate |
| Shelf life (sealed plate) | 60–90 days at 55–70°F; 6–9 months at 35–40°F |
| Ships | Within 1 business day |
Sterility and quality
Every plate is poured, inoculated, and inspected at Myco Labs under HEPA-filtered laminar flow, sealed with parafilm immediately after inoculation, and incubated in a dedicated clean room until fully colonized. Each plate is visually inspected for contamination before it's approved for shipment — if it doesn't look right, it doesn't ship.
Other ways to grow ChestnutPrefer an injectable culture? See the Chestnut liquid culture syringe. Want to skip the lab work entirely? The Chestnut grow kit is ready to fruit.
FAQ
Is this the same as "Chestnut Oyster" or the brown "chestnut mushrooms" at the grocery store?
No to both. This plate is Pholiota adiposa, a completely different genus from the oysters. "Chestnut Oyster" is an occasional nickname for Golden Oyster (Pleurotus citrinopileatus), and in the UK, supermarket "chestnut mushrooms" are brown cremini (Agaricus bisporus). If you're after the glossy, clustering, wood-loving Chestnut mushroom popular in European and Asian cooking, this is the one.
Is Chestnut harder to grow than oyster mushrooms?
A bit. Chestnut colonizes more slowly than the oysters and needs a sterilized, supplemented hardwood substrate rather than pasteurized straw. Slower colonization gives contaminants more time to compete, so clean technique matters more. If you've successfully grown oysters or shiitake on supplemented sawdust, you're ready for Chestnut.
What substrate works best for Chestnut?
Supplemented hardwood sawdust (hardwood plus bran) or a masters mix (roughly 50/50 hardwood sawdust and soy hulls), sterilized. Chestnut is a wood-decomposer and doesn't perform well on straw. Once blocks are fully colonized, a cool, humid fruiting environment around 55–65°F with good fresh air exchange triggers dense clusters.
How should I cook Chestnut mushrooms?
Trim the base of the cluster, separate the stems, and cook them whole — the stems are tender and just as good as the caps. Chestnut keeps its crunch through stir-frying, sautéing, and simmering, which makes it a favorite in ramen, hot pot, risotto, and pasta. A quick sauté in butter with garlic brings out the nutty flavor.
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. Chestnut typically colonizes grain in 14–21 days at room temperature — slower than the oysters, so be patient and keep it clean.
Where do your Chestnut genetics come from?
Every plate is grown from our master culture and 1st-generation isolated Chestnut strain, maintained at our Illinois lab and selected for vigor and clean growth.
How fast do these ship compared to other agar plate sellers?
Within 1 business day. Most agar plate sellers make plates to order, which can mean waiting 2–4 weeks for a plate to be poured, inoculated, and colonized. Ours are produced on a rolling schedule and held in inventory fully colonized. Multi-item orders may take an additional 1–2 business days so we can pack everything together.
Why do you use polypropylene plates instead of polystyrene?
Polypropylene flexes 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. Our Lion's Mane plates are the one exception: they use clear polystyrene for maximum contrast against black agar.
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. Refrigerated at 35–40°F, it stays viable for 6–9 months. Chestnut tolerates cold storage well.
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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