ARIANA COLLECTION by Bloem: The Ariana planter waters when youre not looking and helps keep your plants from drying out. Heres how: Inside the planter, at the bottom, is a hidden reservoir that holds approx. 1″3.5″ water (depending on planter size). This self-watering insert keeps dirt and roots above the hidden reservoir line while constantly providing healthy greenhouse-like moisture through the evaporation process. If youre forgetful, or youre just not home very often, self-watering containers are a must-have. Theyre also helpful if youre growing in an area thats not convenient to a water spigot, such as a balcony.