Hi all, moved into my flat last year, as you expect things went wrong stragiht away, plumbing blow up then wiring lol, having sorted that the fence panel at front feel down, i want to grow a hedge but want to know how deep the soil must be to grow it the hedge as it mainly looks like some sand and concrete, how deep would i have to go to be able to have a 6 footish high bush, and also what would be a nice looking hedge and quick growing ont to grow