What is in coffee grounds that helps house plants?
Hardiness Zone: 7a
By zuzugray from Dutton, AL
I heard it is the acid PH level.
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Why are coffee grounds supposedly good for plants?
Nick from Oakland Park, FL
Coffee grounds are acidic and some plants, like azaleas, like acidic soil. Old, leftover coffee works, too. (10/28/2007)
I found this on nbc4.com:
Q: I heard that used coffee grounds are good for
plants. Is that true?
A: We contacted the Montgomery County Department of Environmental Protection for your answer. It says yes, coffee grounds are good for plants because they're a rich source of nutrients for plants and they acidify the soil. Coffee grounds are great for acid-loving plants like azaleas, blueberries, and hydrangeas. Just spread the used grounds over the roots. Don't use coffee grounds in the soil of roses, because those plants prefer a basic soil. (11/01/2007)