Utah Associated Garden Clubs The Coffee Effect, Beneficial or Not? By Geoff Ellis, Past President, Utah Associated Garden Clubs
(A) Radishes grown in the spring Common garden folklore has it that coffee grounds are a good fertilizer, especially for plants such as azaleas and blueberries that need acid soil. But are coffee grounds really beneficial for our garden plants? Caffeine is a poison, which the coffee plant produces to prevent its seed from being eaten by insects and other pests (it is actually lethal to humans in excessive amounts, but you would have to drink about 30 cups of coffee in one sitting to consume a fatal dose—something that no one, to my knowledge, has ever done).
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