Coffee grounds / spent coffee
The fresher the coffee ground the better. If the coffee ground is old and moldy, you will need to pasteurize or sterilize it depending on your growing setup. If you don't "clean" the moldy coffee ground, you will notice a multitude of different fungi and bacteria growing on your King Oyster mycelium...this could be a very pretty sight, but most unwanted! Even though many cultivators allow contaminations, we prefer to keep them out completely.
After testing many different substrates with every culture we isolate, our findings show that best ingredients for growing Oyster mushrooms are: finely chopped wheat straw, fine hardwood chips or shavings, coffee grounds (only as a supplement), bran and calcium sulphate (gypsum). Of course, there are plenty of substrates that you can use, but these are quite easy to obtain.
The grow bags that we provide have our own unique filter, which allows the transfer of carbon dioxide and fresh air.
2kg of King Oyster spawn is enough to inoculate 20kgs of coffee grounds.
As mentioned above, this method is for home use only.
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