Well I dont want to cut the top. i figure, the bigger the pot, the bigger the plant will grow (provided proper nutrition). so i need something that i guess the roots can grow through (do they actually go all the way to the bottom?)
Do you have any sand or just plain old dirt out of a yard the topsoil on top. But you need about an inch or two of gravel or something on the bottom and small holes on the bottom side edges for drainage through the stone.
Turn it the wrong way up! Im going to experiment with this idea. Poke holes through the can and fill it with compost. Not exactly what you want though.