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Coffee grounds as substrate?

Posts: 51
Location: Ben Lomond, CA
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Has anyone here successfully used coffee grounds as substrate for growing mushrooms? I've got ongoing access to a pretty large quantity of free used coffee grounds from the local coffee shop, and would love to put them to additional use (besides already using them in compost and as cover material for my composting toilet). I'm particularly interested in growing oysters and shiitake, as well as starting a batch of king stropharia to then inoculate my mulched beds, but am definitely open to other types that might grow better on coffee. Any input would be appreciated!
Posts: 632
Location: Edinburgh, Scotland
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There are loads of people doing this, and if I lived closer to a big coffee shop I'd consider doing this, but I live out of town.

Of course, I could just ask for a bag or two of grounds every time I go there.

The great thing about coffee grounds is that they are pre-pasteurised, so you can really just inoculate and go.

This seems to be a good guide on how to go about it: https://www.growveg.co.uk/guides/growing-gourmet-mushrooms-at-home-from-waste-coffee-grounds/

This is also a decent guide, and the author suggests Hypsizygus ulmarius (elm oyster mushrooms) and Agrocybe aegerita (pioppino/black poplar mushrooms): http://madbioneer.blogspot.co.uk/2011/01/coffee-ground-mushroom-spawn.html

I'm not sure whether Stropharia would work on coffee grounds, but by all means give it a try.
Posts: 6686
Location: Arkansas - Zone 7B/8A stoney, sandy loam soil pH 6.5
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everything you wanted to know about coffee grounds check out this post I did last year on all things coffee grounds, it should help you out.

Should you ever need to acidify a plot, just watering with fresh but cold coffee will increase the acidity fairly quickly.
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