This species generates a heavy yield with many mushrooms. It is a hybrid between the Blue Oyster and the King Oyster mushroom. Large caps and short,thick stems can be achieved with low carbon dioxide levels, creating the optimum mushroom. Mushroom bodies may last up to 14 days after harvest in the fridge.


Our grain formula contains the optimum levels of nitrogen required for quick growth of mycelium as well as a high number of inoculation points. Weights of bags are approximated.


We aim to have all our grain spawn ready to dispatch whenever there is an order, but because it is a live mycelium sometimes dispatch may take longer. We will get in touch if this is the case.


Note: We break all of our grain spawn before shipping for your convenience. The grain is fully colonised and can be used as soon as you receive it. The described information has been tested thoroughly and the optimum conditions have been listed. Because of this, results may vary if the appropriate conditions are not met.

Black Pearl Oyster Grain Spawn

  • Species: Pleurotus ostreatus var. Black Pearl

    Recommended substrate: Hardwood/straw (wheat)

    Fruiting duration: 4-7 weeks

    Yield: Approx. 250g of fresh mushrooms per kg of our recommended wet substrate (1st flush); pre-inoculation

    Inoculation % of wet substrate: 2-10%; higher inoculation % leads to a shorter incubation period. Do not exceed 10%.


    Our recommended substrate for this species can be found here.