These pots allow you to water and feed tomato plants easily, they come with watering spikes on the bottom. 3 Pots fit a standard growbag. The Growpot measures 28cm in diameter at the top and 24cm in diameter at the bottom of the watering compartment The inner pot of the Growpot is designed to encourage vigorous and healthy root growth, resulting in higher yields. Just fill the moat with water and tomato feed. The growpot comes complete with instructions Made from recycled plastic and they are 100% recyclable Growpots are built to last for many seasons.