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JP Carlos says
Plus, they add organic matter that helps hold nutrients and water. Blended in to the soil they improve the texture. You can make a decent potting soil with coffe grounds and soil mixed.
You may want to throw in banana peels (shredded of course) into the mix. They're high in potassium, another essential nutrient plants need. I usually make a compost with coffee, banana peels and use it for my plants.