Abstract
Eight commercial cultivars of Lilium × formolongi hort. were raised in cell trays that were bottom-heated at 15°C or 25°C until transplanted on May 12, 2003. Flowering of six cultivars raised at 25°C showed retarded development by the middle of September, but many rosetted plants were found among most cultivars. Only ‘F1 Augusta’ showed desirable characteristics for autumn production with a low rate of rosetted plants and high quality cut flowers. It is considered that ‘F1 Augusta’ bolts after exposure to relatively limited chilling, and is less influenced by the high temperature in summer resulting in rosetting.
