The first thing that comes to mind is when are you pruning the bush? Mike 57 who is in zone 7 found some growing wild and transplanted them to his yard so they shouldn't require much care at all. But then maybe it is the variety that is different. Mine would bare fruit in the fall. Is yours suppose to do that or is it flowers only?

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Check it and see if it has buds on it now...in your zone it should be flowering or about to flower. If it has buds and they disappear, it may be birds eating the buds. Sparrows, for one. love to eat them.
One thing that can stop something from blooming is too much nitrogen fertilizer. That could cause it to put all its energy into green growth instead of flowers. You could try using a phosphate fertilizer.

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Dave
Even my growlights are getting restless!

If you work some bone meal into the soil, it will provide phosphorous for years to come.

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Dave
Even my growlights are getting restless!