Photoperiodic inhibition of stem elongation and flowering in Rudbeckia hirta 'Marmalade'.
Orvos A.R. | Lyons R.E.
Rudbeckia hirta 'Marmalade', a long-day (LD) plant, required a minimum of 4 LD for flower initiation. Continuation of LD photoperiods beyond the minimum cycle number was essential for normal growth and development. Plants that received only enough LD for floral initiation were half as tall and flowered significantly later than plants held in LD for the entire experiment. Limited periods of LD were much more effective than soil applications of up to 50 ppm ancymidol for height control, and 50 ppm ancymidol delayed flowering. Chemical name used: alpha-cyclopropyl-alpha-(4-methoxyphenyl)-5-pyrimidinemethanol (ancymidol).
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