Raw coffee is highly acidic. Used grounds (UCG) are almost Ph neutral. Raw is great for blueberries and azaleas. I add about 70 pounds a week of UCG's. I remove the filters if I am using them in the garden, as they will dry out and litter--I bury them in the depths of the compost pile for the same reason.
Also-- as a top dressing UCG's can prevent moisture from reaching the roots. Scratch it into the soil a little.
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