Do I understand correctly that you are in z8?
If so, Blaumeise should be blooming reliably for you, with exception of the second year after being planted since plant may take a vacation (on blooms), but working hard to establish good root system.

However, since you are posting on NE forum and none of us even theoretically could be in a z8 (z7a would be the best for the people with a good stretch of imagination), here is another answer for you: all hydrangeas from the Teller series are not [bud]hardy in our climate and blooms here and there (if you are lucky) is the norm for them.