Abstract
Cupressus cashmeriana is an ornamental evergreen conifer with little published information on vegetative propagation. Two experiments were conducted to determine the effects of cutting type and auxin concentration and form on adventitious rooting. Experiment 1 evaluated three cutting treatments (softwood, hardwood, and mallet) and four auxin treatments consisting of 0, 2500, 5000, and 10000 ppm potassium salt of indole-3-butyric acid (K-IBA). Experiment 2 evaluated the same cutting types as experiment 1 and auxin treatments consisted of 5000 ppm K-IBA, 5000 ppm naphthalene acetic acid (NAA), 2500 ppm K-IBA in combination with 2500 ppm NAA and zero auxin applied. In both experiments, rooting of softwood and hardwood cuttings was significantly higher than mallet cuttings. Treatment of cuttings with different rates and types of auxin lead to inconclusive results, which indicate auxin may not be beneficial for rooting of C. cashmeriana. This research suggests that the age of plant material is one of the most significant factors for successful rooting C. cashmeriana.
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