Avid coffee drinkers love the kick of caffeine. Well, our plants find it pretty great too. Dilute your left over coffee every other week and water your house plants. Coffee and coffee grounds are a source of nitrogen, phosphorous, potassium, magnesium, and copper that will help keep your plants green and strong. Add coffee grounds to your worm compost or traditional compost. Left over grounds around the base of plants also help keep snails and slugs at bay. Acid loving plants like melons, tomatoes, carrots, roses, azaleas, and blueberries will thank you for the boost. If your not a coffee drinker, tea is good too or ask your local coffee shop for left over grounds.