Pee Gee Hydrangea. Magnificent, tree-form hydrangea with arching branches bears cascades of showy blooms from July to September. August and September it produces huge conical trusses of double flowers-up to 18in long-that are rich creamy white and fade gradually to shades of pink and then brown. As a stand alone plant it makes a broad shrub to 12ft high and 10-15ft wide. Most often gardeners prune it up to create a small tree. Plant in sun to partial shade. Space 12-15' apart.