Its roots can go down for miles so anything that will weaken the growth will be a help. I've got two sorts: one in a nearby dyke and the other more usual one in my flower borders. The reason they don't respond very well to glyphosate weed-killers is because their ferny leaves contain silica (in the old days they were actually used to wash plates etc) so any spraying just runs off. Apart from hoeing and digging, if you bruise their leaves first by treading on them or banging them with a hammer, the ingredients in the spray will be more able to get into its system.