Spectacular Show

This bush in my back yard has really appreciated the rain that we had a few weeks back. It is now just a mass of blooms. I think this is where the stick insect was hiding. I want to prune it as it has gone crazy right in front of the garden shed. I'll wait a bit though & see how long it flowers. DH gave it a hair cut last year & it took off like a weed. Maybe it likes to be pruned. After much reaserch, I still do not know what it is.