I've been noticing this large home in a nice neighborhood gathering debris on the roof. Now it looks like a yard up there. I'm not quite sure of the vegetation, and i'm wondering if they want it like this, or just won't get up there to clean it. I've heard about how mud homes can stay warmer in winter, and cooler in summer. That possibly could be their thinking. We actually have some restaurant nearby that has a landscaped yard on their roof. What do you think, laziness, or trying to save on utilities? Sorry for pic quality; it's from a tracfone.