Mine often don't show up until late May, and I'm in a warmer zone than you. They'll send up shoots when it's warm enough.

Thanks watergal.

Can anyone tell me about the healthy number of shoots a hardly hibiscus should have, or I should make it have?

I would link 3-4 would be better than 10 spindly ones.
Does anyone cut back the number of shoots?

thanks Kevin

I would think 3 or 4 shoots would be more than enough. I often only allow 1 or 2 then pinch the top before it is a foot high and again before those two become a foot long. then you will have a much more controlled growth and more branches to derive more flower buds from.
Good Luck and Happy Growing David