Have you tried DE aka Diatomaceous Earth or a soap solution?
For the soap solution:
A quart of warm water, and one teaspoon of dish soap, mix and put in a spray bottle.
Invasive plants are Earth's way of insisting we notice her medicines. Stephen Herrod Buhner
Everyone learns what works by learning what doesn't work. Stephen Herrod Buhner
If somebody says you look familiar, tell them you are in porn. Or in these tiny ads: