Late spring to fall.
From the Mid-Atlantic and lower Midwest on south.
Rich, well drained, high in organic matter. Soil acidity determines flower color. For blue flowers, mix aluminum sulfate (available at garden centers) to the soil. For pink flowers, lower the acidity by adding a little lime to the soil. Apply these additives in the spring to change the color of the next spring''s flowers. White hydrangeas are not affected by soil acidity.
Hydrangeas prefer moist soil. Water when the soil is moist but not wet.
Fertilize with a plant food formulated for trees and shrubs.
Partial shade (full sun in cool coastal areas).