... plant fiber like bamboo powder, crop stalks, rice hull etc.2.) It is heat-resistant, waterproof, of high strength, non-flammable ... features of our product: 1. It is nonpoisonous and nonfragrant. 2. It can be easily degrade after buried under the soil ... in the goods, please freely contact with me by email or directly call me (13155108851), thanks! biodegradable plastic flower pot sets/ planter sets