Hello!

I am designing an urban garden/greenroof with a soil depth of 12"- 14"(not including drainage layers) .

Does anyone know if it would be possible to plant a large Cornus Kousa- as Kousa has a shallow root system? Is there some reason one needs more depth? It would be given a large rootspread area and be secured/staked during it's first year or 2.

Any reason that it would need more depth to do well?

(I posted this in the landscape section but didnt get a response, so I'm trying here, sorry if one is not allowed to post in 2 categories)