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The influence of temperature, daylength and light intensity on flowering in Hydrangea macrophylla (Thunb.) Ser

, : The influence of temperature, daylength and light intensity on flowering in Hydrangea macrophylla (Thunb.) Ser. Acta Horticulturae (51): 285-298

Experiments on the effect of temperature on bud formation in hydrangea showed that 15-18 deg C were optimal for most cvs. Higher temperatures increased the number of leaf pairs formed prior to bud initiation. Low temperatures during the bud forming period reduced the need for low temperature storage before forcing. Short days hastened flower bud differentiation at high temperature. At 15-18 deg the plants were nearly day-neutral.

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