Blushing Bride Hydrangea
I bought a Blushing Bride Hydrangea, one of the Endless Summer macrophylla hydrangeas, from a local garden center this spring. It was in a one-gallon pot, so the plant was relatively small. I planted it in a very large container to go on my deck. The plant has grown much taller and it's blooming like crazy, but it seems like it's not filling out and there don't seem to be as many leaves as on other hydrangeas I see...instead of flowers against that deep green background, I have flowers and sticks.
What can I do to encourage leaf growth and to encourage the plant to fill out?