Check online with your state's extension site. Ask the question. It depends on the plant. The acidity could change the PH dramatically or it not hurt it at all. Make sure you work it into the soil to avoid little bugs that hatch in compost (grounds).
As an experiment this year, I not only used coffee grounds in the garden and yard, I also used them in the house. All of the plants that I used them on showed no ill effects, and surprisingly, a couple had more growth than at any other time.I even tried "watering" a few with watered down, cooled coffee. The result was amazing! One in particular, a cactus, grew several inches high, and sprouted lots of shoots. This same plant had not shown any significant growth the previous 2 years. Why not try it? I also tried this on a couple of tomato plants, and they did well also. Good luck!
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Tip: Sprinkle Used Coffee Grounds Around Plants
Archived on 06/12/2009
Don't add your coffee grounds to the landfill. Your garden will appreciate them much more! Sprinkle coffee grounds around your plants and trees. You can also compost coffee grounds. It's easy being green.
Note: Coffee (and tea) is toxic to dogs, so please be sure to not sprinkle the grounds where your curious canine can eat them.
By Laura from Long Beach, CA
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RE: Sprinkle Used Coffee Grounds Around Plants
Can coffee grounds from flavored coffee also be used? (01/05/2008)
Use left-over coffee from the pot to water your houseplants. It is great, natural plant food. African violets love it. If there is just a little coffee left, add enough water to get them all watered. Keep coffee black, no cream or sugar, ha! Phyllis (03/31/2009)
It used to be possible to get coffee grounds free from Starbucks. They were glad to get rid of them and had them pre-bagged for people to help themselves. They are also supposed to be good for keeping cats from fouling around your plants. We don't have a Starbucks locally so I don't know if they still do it. We used to take them home when we were on holiday :-) (06/13/2009)
