Four Seasons® Self-watering Plantpots have a tapered shape and rollover rim that makes them strong and easy to handle. With unique water supply and aeration system to keep plants thriving and nurtured for extended periods while saving you time and water. With regular, good-quality potting mix, plants can thrive by taking just the amount of water they need from the waterwell®. The ventilated floor helps aerate their root systems. When used outdoors, rainwater can collect in the waterwell® for later use..