Cultivating Oyster Mushrooms on Spent Coffee Grounds

Repurpose your spent coffee grounds and make a potent fertilizer perfect for growing delicious, nutty oyster mushrooms.

| May 2019

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GettyImages/Lcc54613

Cultivating oyster mushrooms on spent coffee grounds is a simple and enjoyable home activity for all ages, resulting in some good edible mushrooms to boot. If your home brewing doesn’t provide enough grounds, try asking your local coffee shop or roaster if you can leave a bucket for them to toss their grounds into, especially if they would otherwise go into the trash. If you’re not able to inoculate your grounds with spawn right away, freeze them until you’re ready to do so; otherwise molds will form within days.

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Oyster mushroom mycelium colonizing spent ground and filters from a local coffee shop

Although the yields you’ll get from this method are not as high as when you use commercial oyster mushroom formulas, such as pasteurized wheat straw or cotton waste, if you factor in the production costs, the lower-yield coffee grounds method becomes as economically viable as the more sophisticated cultivation. If you simply recycle your own grounds you can expect to produce a few pounds of beautiful oyster mushrooms a week—at which point you’ll need to create an oyster mushroom dressing, sautéing your harvest in a balsamic vinaigrette and tossing it over fresh greens crumbled with feta cheese. (Please note: although I have primarily used this process for cultivating oyster mushrooms, some European growers have successfully fruited parasols from coffee grounds.)



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Oyster mushrooms fruiting on spent coffee grounds nad filters in a 1-gallon container. This cluster striped away the threading and pushed off the lid to escape -- reminding me who is in charge here

Step-by-Step Cultivation  on Coffee Grounds

To begin, you’ll need a container with a lid, a steady supply of coffee grounds (with or without paper filters), and grain- or sawdust-based oyster mushroom spawn.

pfaber
6/26/2019 6:44:58 PM

Caffeine in my veggies? Cool!


AllenT
6/7/2019 1:51:31 PM

I'm starting to see articles stating that we should stop using coffee grounds in vegetable gardens, since the caffeine ends up in the fruits and vegetables. Would that apply to mushrooms as well?






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