Raised beds over concrete?
 

I have some shady redundant concrete areas and I was wondering about
making raised beds directly on them? These, I realise might have poor
drainage but the main problem I have here is extremely well drained
sandy soil.

So, could I then grow plants that love damp and shady places?

Or would I just have dry but poorly drained soil which I've never seen
specified as what any plant wants!

Steve Harris - Cheltenham - Real address steve AT netservs DOT com
A useful bit of gardening software at http://www.netservs.com/garden/