To understand and to establish the cultural and physiological factors which control the growth and flowering responses in Lilium lancifolium, various tests were performed.
To obtain secondary flowers, bulb circumference and weight must be over than 15㎝ and 13∼14g, respectively. For possible cut flower production, planting distance could be 10×10㎝ to produce at least 10 flowers.
When L. lancifolium is grown as a potted plant, potassium nitrate and calcium nitrate fertilization give best results with an aid of growth retardant, ancymidol, which effectively retards growth at 10ppm concentration. The ancymidol treatment further increased the number of flowers. The pH of media must be maintained acidic condition (pH 6.0) and plant must be grown under full light condition without water stress.
The growth retardation by 10ppm ancymidol (30㎖) was completely removed by 5,000ppm GA₃(0.2㎖) and by long day treatment. Increase in the number of secondary flowers is resulted by the interaction between ancymidol and gibberellin treatments. Although ancymidol did not bring any undesirable effect, dikegulac treatment at high concentration (1.600ppm) completely arrested and inhibited shoot growth and flowering. However, these dikegulac effects were partially removed by long day treatment, which clearly demonstrated the interaction between growth retardant and photoperiod treatments.
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