This variety thrives in zones 3-8, and it looks like you are in zone 6, making it a great shrub for your location. Diamond Rouge is a new variety and I’m interested to see how the red blooms change throughout the summer in your area. If you decide to plant it, you’re more than welcome to send pictures my way!
In case you are interested, click for more information about the Diamond Rouge Hydrangea.
You can determine your zone with a quick search online or you can check out the map on the First Editions site here.