Doesn't Roundup control it effectively?
Roundup does basically nothing. The leaves are thick and waxy and so don't absorb herbicide effectively. Supposedly, applying a more concentrated formula on a weekly basis for a month can work, but I don't like the idea of spraying that much glyphosate.
It works. It may take several applications to do so, but it works.
Not sure if that is readily available in all regions, though.