• Weight: Approximately 6 lbs
• Hydration: Average of 47%
• Bags: Gusseted 2.2 mil polypropylene
• Filter: High efficiency .2 micron
• Inoculation Rates: 6 lb. bag of grain will inoculate between 120-165 lb. sterilized sawdust, and 100-130 lb. pasteurized straw
• Sterilization method: Commercial grade autoclave sterilized

• Primordia -  The earliest recognizable stage of fruitbody development. Also known as “baby mushrooms” or “mushroom pins.”
• Fruitbody - A fully grown mushroom, the reproductive structure of the organism in which the spores are produced.
• CO2 sensitivity - When CO2 levels are too high, yields will decrease, stems will become long and stringy, caps will be small, and/or growth will halt.

Black king mushroom grain spawn can be mixed into sterilized hardwood sawdust to create beech substrate blocks.

Note: Grain spawn must be mixed with bulk substrate before you can fruit it. If you are new to growing mushrooms, we recommend purchasing a book on mushroom cultivation.

Recommended reading:

'Growing Gourmet and Medicinal Mushrooms' by Paul Stamets

'Organic Mushroom Farming and Mycoremediation' by Tradd Cotter

If you don't plan to use immediately, you can refrigerate your spawn for up to 4 months.

Black kings have a neutral and savory flavor that lends itself well to many different cuisines and recipes. When thinly sliced, they will sear nicely in a pan. With some grated Parmesan cheese, extra virgin olive oil, and fresh thyme, they make a great topping for pasta dishes.

Our grain spawn is USDA certified organic and made using organic cultures from our own culture bank. It contains a blend of locally sourced, organic, and non-GMO grains and supplements from farms in New England and North America.

If you’re going to consume home-grown mushrooms, make sure to cook your fresh mushrooms thoroughly with heat. If it is your first time eating this species, it is best to start with a small amount to check for allergies, even if cooked.

Grain Spawn FAQ