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Five taxa of  Helichrysum  Mill. and  Brachycome  Cass. were recently evaluated for greenhouse production and amenity use. Preliminary studies on the influence of photoperiod, temperature, and growth regulators were conducted for  H. bracteatum  Vent., (syn  Bracteantha bracteata ) `Sunray' and `Matilda Yellow',  H. apiculatum  D.C, (syn  Chrysocephalum apiculatum ) `Golden Buttons' and  Brachycome iberidifolia  Benth. `Jumbo Mauve' and `Mauve Delight'. All taxa of  Helichrysum  were quantitative LD plants, flowering slightly more rapidly under night-break (2200-0200 HR) and extended day incandescent lighting, compared with 9-h short-day treatment. No influence of photoperiod occurred with cultivars of  Brachycome . Constant temperature of 12, 20, or 28 °C were provided and all taxa demonstrated a linear decrease in flowering time as temperatures increased. The growth index (average of height and two measurements of width) was also influenced by temperature. Paclobutrazol and daminozide were applied at different concentrations and frequencies. Paclobutrazol was more effective than daminozide in both genera, and daminozide was ineffective in  Brachycome .

199 Influence of Photoperiod, Temperature, and Growth Regulators on Growth and Flowering of Helichrysum and Brachycome