David Lang wrote:

"Owain" wrote in message
Either long-lasting weedkiller (if you don't mind chemicals) or
geotextile membrane underneath (if you do).


Sodium Chlorate seems to work a treat, they reckon it lasts 6 months at
least.

Not on our drive it doesn't, I've used both Sodium Chlorate and
"Pathclear", they keep it weed free for a month or two if we're lucky
but no longer.

--
Chris Green