Nepeta subsessilis

Hi gang,
 
I saw this plant on the Amer Hosta Soc's national convention tour last summer (here in Mpls, MN, zone 4), growing in pots.  I'm updating my "want list" and this is one I'm adding. In the book Amer Hort Soc A-Z it says z5-9 with bright blue flowers from midsummer to early autumn, up to 36" tall.
 
Anybody growing it? Does it like sun or shade?  Do you like it?
 
Cindy Johnson
White Bear Lake, MN
zone 4a
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