The Minimalistic self-watering planter work on a reservoir system. There is a water storage tank, at the bottom of the container, which you fill. There is an overflow hole, so excess water simply drains away. The soil soaks up the water from the bottom, so as long as you keep the reservoir filled, your plants get a consistent level of moisture, delivered directly to their roots.
- Make sure you place some small rocks first before you place the soil, this will help keep the water storage tank at the bottom clean