It is never recommended to use RoundUp if it is not for professional use.
Try to get rid of the weeds manually and indeed, use a nylon cloth, as you
probably will need this anyway. It is a non-chemical solution with more
lasting effects, but the investment is a bit larger.

Nick

"Trent-Lion" schreef in bericht
...
In the GH I am restoring, I put some old paving bricks down to cover
the dirt floor before thinking about the potential weed problem. Is it
safe to use Roundup on the weeds that come up inside the GH, or should
I go to the trouble of removing all the bricks and putting down
weed-blocking cloth? Thanks.
T-L