Anti-Weed covering
 

I want to cover quite a large area (about 20m x 7m) with a ground cover mat
to stop weeds growing by excluding sunlight, but letting rain penetrate to
water the trees which will stick through the ground cover. Any suggestions
for the best & most cost effective sort of membrane etc (not old carpets
please!).

Simplest is a weed supressing membrane and should be available from a
good garden centre, but perhaps cheaper on-line.
Mike