Optimizing the balance between technology, size, design, and functionality, EarthPlanters are the result of ten years of research. These planter are successful because of a patent pending RapidWick™ watering system that delivers the nutrients your plants need, automatically. RapidWick goes to work immediately and adjusts the water flow rate automatically as moisture demands change due to weather conditions. Each planter has a planting tray for soil-less mixture and this design promotes a deep, even distribution of water to achieve great results. A large water reservoir lets you go anywhere between one week to two months between watering. Refill periods depend on size of planter (smaller need more frequent refills) and environmental conditions. An overflow assembly means your planter can never be overfilled. All the guesswork is taken out so there's no risk of under-or over-watering your plants and the proper amount of water, air, and nutrients are delivered to the root system at all times. Plants will thrive and daily maintenance is eliminated.