rooftop gardening

Question

How deep does the soil need to be for a rooftop garden? I’m just doing some research for a book I’m trying to write. I don’t have a green thumb. I’ve been known to kill cactus. The story includes a rooftop garden, and I’m trying to figure out about what kind of dimensions I will be working with.

Answer 1

Here is a link for you to read.

https://www.gardeningknowhow.com/special/urban/creating-your-own-rooftop-garden.htm