24Overall funnels water to the deep root zone and prevents run-off erosion and invasive weeds This ring OPENS and Closes for new and existing Trees Shrubs and Roses Holds 5 gallons of water Provides protection from mowers and weed whackers Easy to install and “Made in AmericaAlso available in 16 and 20 inch Planting Rings are available in 16-inch 20-inch and 24-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. Planting Rings Sizes are. * 16 diameter for 1 gal. plants holds 2 gal. * 20 diameter for 5 gal. plants holds 3 gal. * 24 diameter for 15 gal. plants holds 5 gal.