I have added soil to my k-cups and started seedlings in them. It has been successful so far. I have about 18 plants ready to transplant into bigger pots now.

I am sure I've read that blueberries thrive in acidic conditions so has anyone added coffee grounds around blueberry bushes? And if so what results did you get?

I add coffee grounds to my indoor plants and it seems to work well. I have never had mold inside. I mix it well with potting soil, worm castings and compost when I first pot the plant, when adding it later I only use a couple table spoons at a time and mix it in with a garden "fork".

This is good to know that coffee grounds can be beneficial to plants that thrive on acidic soil as well as being able to be added to a compost pile. Another great way to reduce waste. thank you.

I always put my coffee grounds in my garden, but not on inside house plants because of the mold. :)