Track_Shovel Mod ,

Sorry I've been asleep at the wheel for this community.

Anyway, there is a lot of good info here in the advice you already got.

Coffee grounds aren't acidic, and their pHs are typically 6-7 which is fine. pH usually doesn't start becoming an issue until it approaches 5.

Further, grounds have a great C:N ratio, which means they will decompose relatively fast in the soil, and won't tie up N like other amendments do.

verity_kindle ,
@verity_kindle@sh.itjust.works avatar

I've mixed hundreds of pounds of used, fermented grounds into my 1100 sq ft. of loamy clay soil over the last three years. Some plants love it, a few don't. I had the soil tested at the beginning and end of the three years and it didn't change the pH significantly. The grounds start to sour, ferment and grow fungi as soon as a day after being stored, so get it out in the garden as soon as possible.

mambabasa OP ,
@mambabasa@slrpnk.net avatar

Oh that's interesting. I noticed the mold as well when I leave it out. Could I grow mushrooms on it?

verity_kindle ,
@verity_kindle@sh.itjust.works avatar

I don't know enough about myco propagation to answer. I know they need rich organic matter. I always mix my grounds with composted cattle manure, food scraps and straw.

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