– Our plastic tree tubs are constructed of medium density linear polyethylene. They have UV inhibitors for outdoor use and prolonged life expectancy. The tanks are nestable which aids in reducing shipping costs. The smooth inner surface makes them easy to clean and their lightweight allows for quick set up and relocation. Our tree tubs are great if you would like to have a small garden but have no room in your yard or you have disagreeable soil. These plastic tree tubs come in a variety of colors to fit your design needs.