Plenty of the stuff on my allotment too! I don't like to leave it to grow rampantly- it seems to grow too fast and strangle things, and my neighbouring allotmenteers don't really appreciate it.
Sheet mulching with cardboard let it spread- it just spread underneath the cardboard and
compost and woodchips and sprouted all over the place. Putting down plastic sheeting for a longer period beat it though. It still lives between my raspberries and stuff, but in manageable small amounts.