Organic Black King Mushroom Grain Spawn

Our USDA-certified organic black king (Pleurotus spp.) grain spawn features a strain that produces hearty mushrooms with beautiful brown marbled caps and soft stems. When cultivated successfully, you can expect a large harvest of very meaty and delicious mushrooms. Black kings offer the hearty texture of king trumpets, but the growth style of a regular oyster.

Black king prefers cooler temperatures and is prone to drying out or stopping growth if humidity is not maintained when the mushrooms are still in their early stages. This species requires high CO2 to achieve delicate, long stems, but can also be fruited like oysters.

Recommended use:

Black king grain spawn can be used for indoor production using sawdust-based sterile substrate.
Do not use grain spawn for log inoculation.
This is not a mushroom grow kit. Black king grain spawn must be combined with a substrate in order to fruit.

Upon receiving your spawn:

Remove it from the shipping box as soon as possible. Then, unfold the top of the bag, making room for air space. It’s also important to check and confirm that the filter patch is not obstructed. This will help the organism breathe and continue to thrive!

Scroll down for specifications, growing, and storage guides.