Catmint. Variety Purrsian blue. Thought it was a misprint, but presume it's a feline pun on prussian blue, persian blue etc. Bought for us from Lancaster's when we bought Anna's clematis. Snouty or our favourite hairy footed flower bee was taking advantage.
@casablanca think this is the one not so popular with cats despite its name and it also being in the same family. Catnip is the one that drives cats wild!