^Richmond doesn't allow the use of herbicides like roundup any more. We can only use the iron/vinegar based ones. Actually I just killed them by pouring boiling water on them, and then digging them out. Unfortunately, the driveway is made out of just 6 large concrete slabs, so I can't lift them up or anything. Previous owner had some small pieces of wood wedged into the gaps, but they were starting to rot and came out when I pulled up the weeds. Maybe I'll try putting some new wood in there
edit: anybody know if there is anything similar to this available in the lower mainland?
http://gaparmour.com/