The following was received via email: Hi i might have signed in with the wrong ideas, All I want is to know what plants do best on and roof top garden. I have just been lucky enough to rent a penthouse which faces south/west and west/north. It is a tar and gravel roof with a deck and a 50 foot long west/north wall. I would like to have some big pots and hanging baskets. not sure what will grow. If you can help it would be greatly apprieciated.