Best to add it to compost but a moderate amount can be added around plants. Provides nitrogen and has a slightly acidifying affect to the soil. I discovered a few years ago one can over do it in the garden. I added from a coffee shop 15 gallons of grounds a week to my compost for almost a year. I definitely over caffeinated the vegetable garden. Apparently one can do that...Plants did not do well that year. Now I just use the grounds I generate at home..