Posted: 26/04/2014 at 06:57
I agree with artjack, you will get some seedlings but because they can't get a foothold they are easily done away with.
Any plant denied light will eventually die. It all depends how persistent the plant is in getting through the barrier in the meantime!
It is best to start with no weeds before putting down the ground cover. You could say that otherwise it's like closing the stable door after the "horse" has bolted!