Self Watering Planters are designed to give a convenient plant care. Bio Blooms planter has a reservoir which holds water. The divider disk allows water to be in continuous contact with soil/medium through its slits. Soil absorbs water via capillary action and the plant gets water as and when required. WATER SAVER : Since water is stored in a plastic chamber, evaporation is minimal. NO TO MOSQUITO BREEDING: As the bottom tray is not required , there is no mosquito breeding.