The entire Garden Tower is made from 100% recyclable food-grade plastic. Its simple, sturdy construction ensures many years of trouble-free use. The plastic currently used to produce the composting vertical Garden Tower is food-grade high density polyethylene. We selected HDPE because it is free of BPA and other plasticizers and impurities that can become bio-available over time. In time, we plan to explore the available bio-based plastics to further reduce our footprint. No plastics in the Garden Tower contain BPA or phthalates. The tower is engineered to provide at least 7 years of resistance to UV radiation before the integrity of the tower's shell is significantly reduced; however, in many scenarios the first life of a Garden Tower could be much longer.