Lowes stocks all sorts of things that are out of zone. In some cases WAY out of zone. And local help, in my experience know nothing. Best to always check carefully. Now I admit that I am a zone pusher and seem to have a micro climate. I am technically 5B, but have done ok with lots of Zone 6 stuff.
What irks me is them selling stuff that is tagged for Zone 9 or higher and they give no indication of this. Buy hey - the front of the tag says Perennial. :-)
My Lowes is still not 75 % off.