thats a hard one, i dont know a whole lot of pacific northwest forbs
but i do have some that are native to your region that i have
little bluestem
side oats grama
nodding onion
western shooting star
some types of NATIVE(
) geraniums
harebell
stiff stem flax
wild bergamot
maximilian sunflower gets tall!
jerusalem artichoke(its not actually an artichoke)
Spotted joe pye weed(its not a weed
)
new england aster(one of the best!)
now if you research these, make sure you type in exactly the name i put in
there are closely related members to thses that wouldnt do so good in your climate
you can find pictures on the web or i can post pictures from my prairie garden, or the web