I used a sheet of black plastic from home depot. comes in a roll and not very expensive. Cover the area where you have the weed problem and pin it down around the edges. Moss seem to tolerate a lack of sun much better than weeds. I checked it each day to ensure there was not too much stress on the moss. After about 5 days the weeds were all dead and while the moss was not happy it did come back quickly.
I try to pull weeds manually but I use this technique when they get out of control.
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Propagating info.
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