I think you can leave the bush for this year. Some people never cut them back, but I find that it makes them leggy instead of bushy.
I cut mine back in Feb. or early Mar., depending on the weather. You might wait a little longer in your area. When I see a little green, then I cut them back.
It won't hurt the
flowers next year,as long as the shrub has not bloomed out. That's why I cut in back in late winter.
Don't worry, it should be fine this year. Good Luck!!!!! <img border="0" alt="[clappy]" title="" src="graemlins/clappy.gif" />