V. Opulus sterile?

Why "sterile"? I thought V. opulus flowers started out pale pink. Is it the green color that marks them as sterile?

I think the snowball flowers are sterile, the normal opulus flower is flat I believe.

check this out:

http://www.classicviburnums.com/index.cfm/fuseaction/plants.plantDetail/plant_id/7161/index.htm

Got it. That link describes it in everything but the rounded shape. I thought it was supposed to be shaped like a hibiscus because that's what it looked most like when we moved in (mid-September).

So - if I prune it correctly will it get rounded again?

Should I cut it way back and let it start over? I had to do that to a forsythia that had been allowed to get 20' wide and prevented crews from getting to the phone and internet service box.

I don't know much about pruning but I'd ask that question in the shrubs forum they have a lot of knowledge there