In article . com,
wrote:
I think one of the current solutions is to fit a membrane under the
paving (no use to you (or me) now I know) and that pretty well
prevents the problem (rather than looking for a cure).

Doesn't work.

Weed/grass seeds will happily germinate in the sand between blocks
which is *above the membrane.

Yes - but are easy to remove. Since they can't root so deep. The awkward
ones like dandelions won't even try.

--
*Modulation in all things *

Dave Plowman London SW
To e-mail, change noise into sound.