Intermediate Cultivation
King Oyster

Strain Profile

Deserving of its name, the King Oyster is one of the largest of the genus.  Particularly popular in Europe, this dense and fleshy mushroom makes an excellent meat substitute.

Eryngii fruits on hardwoods, and is suitable for intermediate-beginners.  It will fruit on straw, but yields are low compared to P. ostreatus or P. pulmonarius on the same substrate.

Growing King Oysters on supplemented hardwood sawdust is standard practice, with a usual Biological Efficiency of 65-80%.

This strain fruits from 15-21˚c.  Benefits from a brief drop in temperature (‘cold shock’) to ~10-15˚c to help induce pinning, before increasing to fruiting temperatures.

Preferred agar culture media:  MYPA, PDYA

Preferred substrate:  Hardwood Logs, Supplemented Sawdust. Particularly favours Oak and Beech.

Also Known As: 

  • King Trumpet
  • French Horn Mushroom
  • King Brown Mushroom
  • Boletus of the Steppes

Growing Parameters

Spawn Run

Temperature: 22-24°c
Relative Humidity: 90-95%
Duration: 12-16 days
CO2: >5,000 ppm
Fresh Air Exchanges: 0-1 per hour
Light Requirements: n/a

Primordia Formation

Temperature: 10-15°c
Relative Humidity: 95-100%
Duration: 4-5 days
CO2: <1000 ppm
Fresh Air Exchanges: 4-8 per hour
Light Requirements: 500-1000 lux


Temperature: 15-21°c
Relative Humidity: 85-90%
Duration: 4-8 days
C02: <2000 ppm
Fresh Air Exchanges: 4-8 per hour
Light Requirements: 500-1000 lux

Pre-Poured Agar Plates

MEA, MYA, PDA, PDYA, Activated Carbon
In a range of colours!
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