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This study was conducted to examine the effects of kind, concentration, and treating method of plant growth regulators and floral buds on rooting in hardwood cuttings of white forsythia (Abeliophyllum distichum Nakai). Varying concentrations of NAA, IAA, IBA, uniconazole, or spermidine were treated to hardwood cuttings by dipping, soaking, or powder method. Rooting ability of hardwood cutting treated with dipping method in April was better than with soaking or powder method. Dipping with 500 ppm IAA or 100 ppm IBA for 1 min increased the rooting percentage up to 65%, and was also effective in root growth. In August, rooting ability of hardwood cutting was best improved by NAA or IBA dipping than by other treating methods. Especially, treatment with 500 ppm NAA or 1000 ppm IBA for 1 min showed the highest rooting ability. Removal of floral buds in hardwood cutting promoted the rooting, however, this inhibitory effect was not eliminated by natural winter chilling.
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