More than two billion cups of coffee are drunk worldwide every day – and that creates a mountain of used coffee grounds.

Too many grounds could be harmful to the very insects that keep soil healthy. "The coffee grounds contain caffeine and ...

These plants also contain other nutrients ... and sometimes oolong tea—all of which naturally contain caffeine. The amount of caffeine in kombucha varies based on how it's made.

In fact, many native plants don’t need regular irrigation at all once they’re established with root systems that find water deep in the ground, so if you plant native perennials, say ...