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- Author or Editor: A. T. Y. Tse x
Plants of the ‘Cara Mia’ rose (Rosa hybrida L.) grown at elevated day temperatures with long photoperiodic cycles or at reduced night temperature with short photoperiods differed in shoot growth rate, petal number, final stem length, and harvest date when compared to plants grown at suggested day and night temperatures. Node number remained nearly constant under all growing conditions. Plants of ‘Town Crier’ rose grown with a night temperature of 13°C (minimum) during the first 3 weeks following shoot removal produced flowering shoots of the same length in the same amount of time as did those grown at a minimum night temperature of 17°C throughout shoot development. Cooler night temperatures during the second 3-week period after shoot removal increased flower development time by four days but did not affect stem length. Results indicate that some rose cultivars can tolerate lower than normal night temperatures for a portion of the growing cycle without reduced growth and/or yield.