ARIANA COLLECTION by Bloem: The planter waters plants when you?re not looking and helps keep your plants from drying out. Here?s how: Inside the planter at the bottom is a hidden reservoir that holds approx. 1 inch to 3.5 inches of water (depending on planter size). The self-watering insert keeps dirt and roots above the hidden reservoir line while constantly providing healthy ?greenhouse-like? moisture through the evaporation process. If you?re forgetful or you?re just not home very often self-watering containers are a must-have. They?re also helpful if you?re growing in an area that?s not convenient to a water spigot such as a balcony. How a self-watering planter works: the potting mix is held above the water line by a sturdy screen. The water chamber is connected by small porous channels filled with soil which then acts as a water wick. As water is used by the plant or evaporates from the surface of the soil capillary action draws more water up from base of planter. The soil has j