Coffee, Charcoal for Plants
Name: Kevin B.
My dad says the residue left over from burned charcoal is good for plants and my mom
says coffee grounds are good for plants. Is there any proof that either one is good for plants
Charcoal would offer mostly carbon but needs to be balanced by nitrogen from another source. Coffee
grounds would add organic matter to the soil but possibly too acid for plant growth if too much
used. Also charcoal might contain other chemical additives that could be harmful to plants and to
those consuming the plants if for vegetables. Probably safer to add to compost for later use rather
than directly to garden soil.
The following might be helpful:
Anthony Brach, Ph.D
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Update: June 2012