I take a lot of vitamins and minerals. When the bottle is empty, I fill it with water, give it a good shake and use it to water my plants. I figure, hey, if it's good for me, it's good for the plants. And if my plants start wilting and turning brown....then maybe I'll go ahead and switch companies! All I can say? My coffee plant is thriving since I started fertilizing it with my minerals. It's never looked better.