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Heuchera  cultivars were studied to examine the influence of photoperiod and refrigerated storage on vegetative and reproductive growth. As daylength increased from 9 to 15 hours, using day extension, petiole length and leaf area increased. Daylength during the forcing period appears to have minimal influence on reproductive growth. Forcing under 15-m daylength reduced the time to inflorescence emergence and delayed the time to anthesis of first floret and inflorescence maturity in comparison to natural daylengths or short days. Cold storage (4°C) for 14 weeks resulted in quicker inflorescence emergence than no storage or 10 weeks of storage.

764 PB 310 GROwTH AND FLOWERING OF HEUCHERA CULTIVARS