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Soil Amendments

Q.what do you mean by “washed coffee grounds”?

Zone 90602 | Anonymous added on April 14, 2020 | Answered

I take the used coffee grounds out and dump into my planters…I have not also washed or rinsed them. Why would anyone do that? I think I am missing something in the discussion.

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Certified GKH Gardening Expert
Answered on April 16, 2020

In the article below, they are comparing the use of unwashed (fresh) coffee grounds with used (brewed) coffee grounds as a way to lower the pH of soil. Fresh coffee grounds are acidic, whereas once the grounds are brewed, they become neutral. I believe the author is using the words "rinsed" or "washed" to denote brewed coffee.


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