Having taken on an overgrown allotment this season, i have been fighting
back a forest of weeds all year.
The problem seems to have got out of control over the last month & i now
have a wall-to-wall carpet of weeds.
I feel like blitzing the whole lot with weedkiller in the autumn, can anyone
offer advice on what the best time
of year would be to do this & possibly the best chemical to use?

thanks

DD