Tip for getting rid of perennial weeds like ground elder, mare's tail, convulvulus etc.
Take a pair of rubber gloves (marigolds will do)
2 small pieces towel (2in square)
2 thin rubber bands (such as postman uses)
Pour some NEAT Roundup into a deep bowl
Put on gloves, and secure pieces of towel on end of thumb and forefinger using rubber band
Dip thumb and forefinger in neat roundup and rub on a few leaves of the offending plants
They will be dead to the roots in a couple of weeks.