Tripora divaricata

Bluebeard, Blue Spirea (f.k.a. Caryopteris divaricata). Unusually shaped blue flowers from late August into October. Typically listed as hardy through 6B. They've been growing next to our garage (north side) in 5A since 2017. Some years a heavy, early frost takes out the blooms. 3'+ tall x 2' wide. Germinate at room temperature.