Hardiness Zone: 7a
I take what ever left over coffee and finish filling the pot with water and add directly to plants inside or out. The really thrive on it.
You can use cold coffee on plants but you need to dilute it before pouring around the plant
Rhododendrons and blueberries are also acid loving plants. I just dump the old coffee around the bottom of the plants.
Use it on acid loving plants such as gardenias, azaleas, etc. Also put on vegetable gardens. You can pick up "used" coffee grounds for free at coffee shops such as Starbucks, they give it away by the bagful! good luck.
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