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- Lab tested batch
- Grows or replaced
- Free over $75
- Difficulty
- Beginner
- Fruiting temp
- 60-75°F
- First harvest
- 12-16 days
- Character
- Firm, faintly sweet
Live, lab-tested Elm Oyster liquid culture in a ready-to-inject 10ml syringe. Firm white caps, a mild sweet flavor, and unusual tolerance for imperfect conditions.
Despite the name, Elm Oyster is not a true oyster at all — it sits in a different genus, and it behaves like it. The caps are thicker and firmer than a Pleurotus, the stems are stouter, and the whole mushroom holds together far better in storage and in the pan.
What makes it worth growing is its temperament. Elm Oyster shrugs off conditions that would deform a true oyster: it fruits acceptably in higher CO2, tolerates humidity dips, and does not stretch and go leggy nearly as readily. For growers working with an imperfect setup, it is the most reliable species in this list after Blue Oyster.
The flavor is mild and faintly sweet, less assertive than a Golden Oyster, with a firm bite that suits roasting and grilling.
At a glance
- Thick, firm white caps that store better than true oysters
- Unusually forgiving of high CO2 and low humidity
- Mild, sweet flavor with a satisfyingly meaty bite
- Fruiting temperature: 60-75°F (15-24°C)
Species: Hypsizygus ulmarius · Volume: 10ml live liquid culture · Lab-tested, cleanroom-produced
Growing guide
Growing guide
Every order includes a printed step-by-step guide for this exact species — setup, daily care, and harvest timing. Questions mid-grow? Write to us; growing advice is free and answered by people who grow.
Shipping & returns
Shipping & returns
Orders ship within 2 business days in protective packaging. Live cultures are covered by our replacement promise: if yours arrives compromised or fails to colonize, tell us and we will make it right.
Lab testing & quality
Lab testing & quality
Produced in a certified ISO7 cleanroom and batch-tested by an independent licensed laboratory for contamination before shipping. Named species only — never blends.
