These EzGro vertical garden kits let you grow like a pro, almost anywhere, with less time, space and money. The gardens work because of three important components. First, EzGro Quad-Pots, these are the stackable planters which each hold four plants and allow water to flow. Second, special medium which replaces soil and allows the plants to get the right amount of water without drowning. Third the formula, a special blend of hydroponic nutrients which ensure your plants grow fast and healthy.