Sorry to stalk you but I just saw your 5/31 pics in the gallery and must know about that shrub that has tall blue spires. It is exactly what I need! TIA and thanks so much for sharing your gorgeous garden!
I'm not sure of exactly to which blue spiked 'shrub' you are referring.
If I recollect correctly, all of the blue spiked flowering plants are varieties of salvia. In the photos being discussed are 'May Night', 'Caradonna', and 'Amethyst'.
Providing more info about which photo might help to pin it down.