info on this species in Maine

Arrowhead Alpines list 2 species-maybe contact them?

From what I have been able to briefly gather from spot checks on the net is that your best bet is trough gardening.
You may want to google trough gardening, screes, crevice gardening, alpine plants, and related topics you will discover at the sites you visit. There is alot out there and the plant you are interested in should be ok with this kind of treatment.