We don't have information on the origin of 'Blue Muffin' and therefore what genetic population (locality) it is derived from. It may have been selected by a nurseryman in Wisconsin, but that isn't necessarily where it originated. That said, its only appreciable difference from wild types is its "improved" fruiting (richer berry color) and compact growth habit, so it likely will provide good wildlife benefits with minimal pollution to the genetics of wild Arrowwood populations if seedlings happen to germinate off-site.

Miri

Thank you so much!  It's funny that it's billed as having a 'compact' growth habit: mine is 8' tall and 3' wide!  It doesn't sucker much though.  I'll plant the true native version next spring with a clear conscience. 

Yes, sometimes "compact" refers more to overall habit (denser, perhaps more branching, maybe slower overall) than eventual mature size, even though it sounds like it should. Sometimes, despite being trialed for several years prior to introduction into horticulture, new plants are discovered to have larger mature sizes than the breeders initially thought based on how the plant was growing in youth. Several horticultural websites and nursery growers agree that 'Blue Muffin' isn't quite as compact as stated in the breeder's initial advertising.

Miri