Passive : Luwasa 7in

"These patented Swiss soilless systems are self-watering, clean and maintenance free. You will develop an instant green thumb the first time you use a Luwasa. Each 7-inch white planter unit contains its own expanded clay pebbles and a unique Hydrogauge which allows a quick visual check of the water level, and a pack of two hydroponic nutrient pellets. You only add water once every two or three weeks, making it perfect for frequent travelers. "