06/11/2026
One of the biggest questions we get asked is: how do self-watering planters actually work?
So we put together a simple guide that breaks it down — including how the built-in reservoir works, how water moves into the soil, and a light science lesson on capillary action.
If you’ve ever wondered how a planter can help water your plants without pumps, power, or complicated parts, this one’s for you.
Read the full blog to learn more.
Wondering how self-watering planters actually work? Learn how Algreen’s reservoir-based planters use small water-access openings and capillary action to help soil draw moisture up to your plants between waterings.