This is "Pee Wee" Oakleaf Hydrangea in March of this year. It's pee wee because it doesn't grow nearly as large as traditional oakleaf hydrangeas but it gets plenty big to make a statement in a container. My container is pretty large--maybe 24 inches in diameter. The information on the plant tag said this shrub (hardy to zone 5) will grow to about 3 feet by 3 feet. Mine might be a little larger than that. It likes morning sun and will bloom through July. In the fall, the enormous leaves will turn a burgundy color so at least it will still look sort of interesting after all of the blooms are gone. I have it planted with a perennial geranium (see the last picture) which winds its way up through the gaps of the hydrangea in a most appealing way. Scroll for more pictures.
Bookshelf: Container Gardening Books