white dwarf roof grow please help

Sup yall, i am just about to start a few buddha white dwarf plants on my roof. Does anyone have any advice on these? how big did they get....and i dont wanna get caught cause they r on my roof. Is this a good plant to top?

Do you ever see or hear air traffic above your building, is it higher than others around it can people look down from a window and see your shit?

its very rare i see a helicopter fly over my area but yeah my house is taller so i dont think anyone can see them and i threw up some tomato plants on the side of the planter im planting them in.