Many gardeners are interested in using a rain barrel to collect water. But it is important to use the water you collect correctly! Saved rainwater can be used to irrigate trees, shrubs, and flower beds. You can also use it to wash the exterior of your home or car if you wish! But because it can often contain particulates from birds, moss, or roofing materials, you should avoid using rain barrel water to irrigate edible plants (and you should also avoid using it as a source of drinking water for people or pets!).