Planting Rings are available in 16-inch diameters and are the perfect product for water conscientious gardeners and landscapers who want a no-fuss, perfectly round border around trees, shrubs, roses or vegetables. Unlike most edging, Planting Rings do not require bending, staking or tools to create a round border. Planting Rings are non-eroding, watering basins that retain water until it can funnel to the deep root zone where it is needed most. The patented V-Groove anchors the Planting Ring into the soil, so it stays securely in place. The naturally, UV resistant, 100% recycled polypropylene protects trunks from weed whackers and provides a clean border between grass, trees and shrubs. Planting Rings reduce surface evaporation, cut down on invasive weed growth and prevent hillside erosion. Planting Rings can also be adapted to couple irrigation systems.