Who has plants growing on top of their grotto? We are building fake rock and I might want some sort of greenery on top or maybe the sides. I live in the desert and the heat is brutal and I'm not sure what my options are. We haven't built the grotto yet but it's going to be 10 feet tall and 35 feet long by 14 feet wide. It's a lot of rock. Otherwise maybe I'll just keep it all rock and make it look like Valley of Fire state park. Hmm not sure what to do.