Hydrangea “Quick Fire” (my second favorite, after oak leaf), with redbud. This is a lacecap style of hydrangea, and its white petals will go to pink and then red as autumn approaches, but in high summer, they’re a lovely cool white.
Lacecaps don’t generally need pruning; you can deadhead to increase flower production if you want, though I usually don’t bother. If your lace cap is older and not flowering much, then in late winter, you can prune off a third of the stems at ground level, and that should revitalize it. Old must make way for the new.