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Gingers are tropical perennials from the Zingiberaceae family with attractive long-lived flowers that can be grown as potted plants in subtropical and temperate zones under protected conditions. Development of production practices for this new flowering pot crop is essential for optimum plant growth. The effect of photoperiod on growth and flowering was evaluated on  Curcuma gracillima, C. cordata, C. alismatifolia, C. petiolata  `Emperor',  Curcuma  `Chang Mai dwarf',  Siphonichilus decora , and  S. kirkii . Plants were grown under daylengths of 8, 12, 16, and 20 h. Plant height, number of new leaves, number of shoots, and leaf area were larger for plants growing under an extended daylength (16- and 20-h photo-period) than for plants under 8 and 12 h. Plants grown under an 8-h daylength approached dormancy sooner than those growing under 12, 16, or 20 h of light, and no flowering occurred.

259 Effect of Photoperiod on Growth and Flowering of Ornamental Ginger Species