I set up a big rectangular container, it's 19"x14" by 9" deep. Even though the surface area isn't that big, this thing holds a ton of soil. The soil is a mix of coco coir, perlite and wormcastings, plus some bat guano and minerals rock soil amendments. So I think there's only enough surface area for four plants, maybe six if I tie them down, but they're going to have a lot of root space.