Yes it's safe, although a little scalding water works fine also.

Dave

"Trent-Lion" wrote in message
...
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