Posted: 27/03/2012 at 22:15
I've only been gardening for a year but I have asked my OH what he would he would do.
He suggests if the tarmic is easily broken up, then turn it upside down as it will then break down and then ask around (maybe from some friendly farmer )get some top soil aprox 5 " in depth.
Digging tarmac up is no easy job so maybe a digger is required?
I would suggest planting a small section at a time, that way you can see what works and what doesn't. Seed a lot in a one space to give you an idea of what you want. The space you have is huge
Hope that helps.............a little