Rain Barrels and Rainwater Harvesting
System
Rainwater harvesting collects runoff from roofs and stores it for later use in the garden. It can help gardeners make use of a local water source during dry periods. Stored rainwater is limited by rainfall, storage size, and household setup.
How it works
Rain falls on a roof and is directed by gutters and downspouts into a storage container or other collection system. The stored water can then be used for hand watering or distributed in other simple ways, depending on the setup. Collection systems need a way to handle overflow when the storage fills. Clean catchment surfaces and secure covers help reduce debris and pest issues.
Best for
It works best where roofs, gutters, and downspouts can reliably direct water into storage near garden areas. It is especially useful for gardeners who want supplemental water for ornamentals, containers, or small food gardens during periods without rain.
Tips
Learn local rules before installing a collection system, since requirements vary by place. Keep containers covered and maintained so debris, mosquitoes, and algae are less likely to become problems. Use stored water regularly so it does not sit unused for long periods.
General guidance for US gardens. Watering needs vary with soil, climate, and weather. Page updated Aug 4, 2026.