Defoliation of hydrangea: Chemical defoliation of hydrangea plants obtained rapidly and without injury to flower buds by prestorage treatment
California Agriculture 11(8):12-15.
Published August 01, 1957
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Flower buds of the common hydrangea—Hydrangea hortensis—are initiated during summer or early fall, but a cold period of 6-8 weeks is required to condition the buds for subsequent flowering.