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Are coffer grounds a useful soil amendment for flower gardens?

I read that used coffee grounds are a useful soil amendment for a flower garden. Is this true?
Submitted by BHGPhotoContest

Coffee grounds contain a small amount of nitrogen, so they contribute nutrients to the soil. They are also slightly acidic. This is good for some soils, but not for all. I recommend composting the coffee grounds instead of just dumping them on the garden. That way you avoid the risk of applying too much of a good thing. In the absence of a compost pile, work some grounds into the soil around your acid-loving plants, such as azaleas, blueberries, and hydrangeas. For noncoffee drinkers, check with your local coffee shop. Many offer complimentary spent grounds for gardens and compost bins if you'll simply haul them away.

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