Hi Hengarden,
to NGA
I can guarantee that it will get out of hand. My neighbor has a few in her yard and I spend most of my summer pulling up seedlings.
My daughter did fieldwork in northeast Idaho (Spencer High Point) a few years ago - I was her field partner. The (equivalent of) agricultural department was offering a bounty to anyone who brought them Russian Sage from that area. One of our destinations was Morgan Crater - I got into a patch of Russian Sage and came away with about 15 bee stings. I spent most of my summer for two years in a row getting stung by bees or hornets.
But that's not the problem with Russian Sage, it is highly invasive and is taking over habitat that native plants once occupied. I don't see anything anymore about bounties on Russian Sage but be prepared for a lot of 'weed' pulling.
Where in southeast Idaho are you? My daughter graduated from Idaho State University in Pocatello with a Master's in Geology.
Daisy