Durable and Affordable Black Plastic Pots for Various Growing Needs Viagrow 1-gallon black nursery pots are measured in trade gallons, a standard term in the horticultural industry for plant container sizes. One trade gallon is approximately equal to 0.71 U.S. liquid gallons. These black pots are BPA-free, food safe, and designed to be both affordable and durable. They are suitable for various types of soil or hydroponic growing media. The round plastic nursery pots feature a raised rim design for easy handling and stacking when not in use and can be reused indefinitely. Specifications: Specification Details Top Diameter 7.875 inches Bottom Diameter 6.