Big leaf, mophead hydrangea blooms on new and old wood—so you'll enjoy large, ball-shaped flower clusters in pink (in neutral soil) and blue (in acid soil) in early to midsummer and again in late summer. Dark green leaves turn bright yellow in fall. Grows 3- to 5-ft. tall with similar spread. Ideal for foundation plantings and containers. Plant in partial shade to full sun. Zones 5-8.