These self-wicking cylinder planters provide your plants with a steady supply of moisture, so you don't have to worry about remembering to watering them. There are three parts to the device: the plastic net pot, where you'll place soil or rocks and the flower or herb; the canvas wick; and the glass cylinder. The net pot's opening allows roots to naturally prune. The wick is attached to the basket and floats down in the water, which should fill the glass container but not actually touch the net pot. Liquid and nutrients are slowly absorbed into the soil or rocks via the wet wicks. Plants that require excellent drainage, like orchids, succulents and cacti, may not be successful in a self-watering containers. This listing includes 4 containers: one green, one blue, one clear/white, and one red.