Try
www.vetiver.com, I am not sure how it will do in your area, but if it works it is really a fantastic plant, non evasive, roots to 12 feet and drought resistant. It eats heavy metals and drinks water like a fish when it's available. It is used for many things world wide, it sounds like a snake oil kind of thing, but my experience in using it for erosion control has been very good. It has been used in the US sincethe early 1900s.
I suffered from massive erosion and rip rapped the inside banks and vetivered the outside banks, overall the vetiver performed as well as the rip rap and was much cheaper and easier to maintain.
