I am not one to ask about plants but I love the idea and i think it is great... do you have holes drilled in the bottom to let the air out so it won't rust? That is one thing i would do if you leave it outside in the rain and i don't know the temperatures there. I love the idea. People here some have taken an old toilet and put it in the garden with tomatoes growing out of it. some like it others find it offensive. I love your idea! tc