There seems to be some question whether this is a native or invasive plant in the PNW. I do know I have a lot of it in my damp lower field, and my local Conservation folks would like to discourage its spread. Since it is growing along a fish-bearing stream, their suggestion is to simply plant larger natives where the canary grass is growing, cut the grass back, and eventually the shade from the natives will overpower the grass. I don't mind the canary grass, it looks really pretty in the wind, and I assume the deer snack on it (I know my dog does).

http://www.fs.fed.us/database/...

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