Unfortunately weeds will still seed in gravel over membrane and tough weeds and bulbs will still poke through membrane from below. It's not the weed stopper some people expect.
I would have the landscaper back - but (for now) just to put right the work done earlier. If he does it willingly and well you can tell him that you'll be happy to have him undertake further work.
I always explain to contractors that I fully accept things can go wrong or that people make mistakes. The mark of a good company is really about how they make good those problems.
Heaven is ... sitting in the garden with a G&T and a cat while watching the sun go down
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I would have the landscaper back - but (for now) just to put right the work done earlier. If he does it willingly and well you can tell him that you'll be happy to have him undertake further work.
I always explain to contractors that I fully accept things can go wrong or that people make mistakes. The mark of a good company is really about how they make good those problems.