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The effects of plant growth regulators and some cutting conditions on softwood and semihardwood cutting of white forsythia (Abeliophyllum distichum Nakai) were examined. Rooting of softwood and semihardwood cutting treated with soaking method was better than with dipping or powder method. In softwood cutting, soaking with 500 ㎎·L^(-1) IAA were more effective than the other treating methods in rooting. In semihardwood cutting, treatments of 500 ㎎·L^(-1) NAA for 1 min or 200 ㎎·L^(-1)NAA for 1 hr increased the rooting percentage up to 100%, and were the most effective in root growth. When 200 ㎎·L^(-1) NAA was treated for 1 hr at semihardwood, the first roots were observed at 20 days after cutting and the rooting percentage of cutting was rapidly increased up to 90% until 50 days after cutting. In semihardwood cutting, as treating concentration of BA and GA3 increased, rooting was inhibited. But, treatment of 10 ㎎·L^(-1) ABA was significantly effective in rooting response. Ten ㎝ long cuttings showed better root growth than 5 or 15 ㎝ long cuttings. Photoperiods did not affect rooting. The more leaves remained on the cutting, the higher rooting was observed. Treatment of 100 ㎎·L^(-1) H₃BO₃ increased rooting up to 100%.
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