|'Grandiflora' is one of the panicle type hydrangeas bearing an elongate panicle flower that can reach sizes of 12 to 18 inches long by 6 to 12 inches at the base. They are initially white, changing to pink and later purplish brown. To produce these large flowers the stems must be thinned to 5 or 10 primary shoots.
H. paniculata is a large growing, deciduous shrub or small tree that reaches a height of 15 feet to 25 feet tall and 10 feet wide. Form is upright and texture is coarse. Mid July flowers are white and turn pinkish to almost purple with age. Flowers are borne in panicles and may be 8 inches long. Thrives in rich, loamy soil that is moist, but well-drained. Does well in full sun or part shade. Flowers on new wood. Because of this lovely plant's size and texture, many designers have a hard time using it correctly in the landscape. It is most at home along the edge of a sunny wooded border or where the landscape is loose and informal.