This shrub seems to be missing from my garden blueprint.
Can anyone tell me what it is.
Also any guidance on maintenance---such as how to control the suckers.
Virginia sweetspire, Itea virginica.
It will sucker
Should I allow the suckering to spread? Or better to continually pull them up and cut out the roots?
It's considered a desirable plant and mostly suckers when it gets good moisture. You only need to deal with the suckers if you don't want it to spread.