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I heard it is the acid PH level.
I would be careful and only put them on plants that like acidic soil. I put coffee grounds around my azaleas and they love them!
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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)
By joan pecsek
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)
By Debbie
