They bloom right at the edge of the season - around the very last frost. They don't last long, but they smell divine.
Ours came with the house and we divided them and let them get big. This time of year they are glorious and they have loved all the rain and the slow cool spring.
They are the old fashioned ones. Loosey goosey in habit. Big blowsy bushes about 8 feet tall. The buds start out rosy, but they open much bluer. The contrast of pink and blue and purple is one of the things I like best about them.
The bees and butterflies love them. If you stand still in front of the bush, you can hear the humming and buzzing.