Coffee Grounds For Blueberry Bushes

Question

I keep seeing reference to used coffee grounds but you also discuss fresh versus washed coffee grounds. Do I brew a pot of coffee and use those grounds and are they considered fresh, or coffee grounds that have not been already been brewed for coffee?

Answer 1

Coffee grounds that have not been brewed are fresh coffee grounds. Once they are brewed, they are used and are neutral in pH. A lot of people think adding used coffee grounds to soil will make it more acidic, but it won't. It will however, increase the organic matter in soil and improve drainage. However, it's best not to overdo. Too much added to soil can actually compact the soil.

The best use is to add used coffee grounds to the compost bin. In time it will increase the nitrogen in the compost.