A cousin to mopheads and lacecaps, ‘Annabelle’ hydrangea (Hydrangea arborescens ‘Annabelle’) is one of the hardiest types of hydrangeas and is native to North America. It blooms in summer, producing large snowy-white clusters of showy florets. For that, it's sometimes called snowball hydrangea. ‘Annabelle’ is also one of the best hydrangeas for deep shade. It blooms on new wood, so the best time to prune it is late winter or early spring. It grows four feet tall and wide in Zones 4-9.

Buy It: Hydrangea Arborescens 'Annabelle', $26.00, White Flower Farm