Why aren't my shrubs flowering?

Weigela blooms best in full sun. If the shrub is growing poorly, it won't bloom well. Consider cutting it back to encourage new vigorous growth from the base. It may also need fertilization, but avoid high nitrogen fertilizers, which promote vegetative growth at the expense of blooms.

It's early in the season to see any growth on any butterfly bush. However, Orange Sceptre is hardy only in Zones 7 to 9, so it likely will not come back at all in your Zone 5 garden.