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Viola  ×  wittrockiana  Gams. cvs `Delta Pure Rose' and `Sorbet Yellow Frost' were grown under different photoperiod and temperature treatments (12–24 ± 2°C) for different lengths of time at different stages of development during the first 6 weeks after germination. Plants were grown with ambient light (≈9 hr) at 16°C before and after treatments. Days to anthesis and leaf number were lowest when plants were grown under night interruption from 2200–0200 hr (2 μmol·m –2 ·s –1  from incandescent lamps) and daylight plus continuous light (100 μmol·m –2 ·s –1  from high-pressure sodium lamps) for `Sorbet Yellow Frost' and `Delta Pure Rose', respectively. Days to anthesis decreased as temperature increased from 12 to 24°C. Plant height and internode elongation were greatest and least in the night interruption and continuous light treatments, respectively. Branching decreased as temperature increased from 12 to 24°C. Implications of these data with respect to classification of  Viola  ×  wittrockiana  flower induction and development of prefinished seedlings is discussed.

Photoperiod and Temperature Interact to Affect Viola × wittrockiana Gams. Development