I have a strong holly hedge, I like it as it does not need pruning very
often. However over the last couple of years other plants, notably
hawthorn,have started to colonise it. This needs trimming frequently.
apart from long, arduous and painfully removing these from the base by
hand is there any other way to remove them? Would wrapping the
protruding stems in sponge soaked in weed killer then covered with a
polythene bag have any chance of working?