Terracotta Watering System by GrowoyaA traditional natural way to save water save time and grow better plants. The Oya is a time honored terracotta vessel that is planted in the ground to naturally perfectly water your garden dramatically reducing your water waste and watering time. Just fill your Oya with water every 7 10 days and the rest is taken care of. Plant roots instinctively grow toward the porous terracotta of the Oya which gives them the water they need so they can give you