Black Plastic -

[Robert_Brenchley]

Digging in the edges causes a bit more work getting it up later, but if you've got couch or ground elder, and you don't dig them in, then the roots run right in under the plastic, and as soon as you lift it you get a forest coming up as though it had never been down at all.

[Robert_Brenchley]

[cacran]

The plastic I put down has tiny perforations so keeping the soilk under it moist, is no problem. I find the ground to be really quite good under it and there are lots of insects, worms and frogs living under it. I have a lot under carpet too.