The next time it rains, try collecting the drops in an easy-to-pour container for watering your houseplants. Potted plants, window boxes and indoor plants will love a healthy helping of freshly fallen rain. Another benefit? Rainwater is not only free to use, but also free of the chlorine and fluoride added to most tap water, giving your plants a healthier drink. If you collect rain for watering, try to use it as soon as possible so nasty bacteria and bugs don’t use your watering dish as a breeding ground.