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Rooting of cuttings taken from ornamental shrubs treated with GA3, paclobutrazol, and Atrinal

Mieczysław Grzesik

Research Institute of Pomology and Floriculture
Waryńskiego 14c, 96-100 Skierniewice, Poland

One- or two-year-old plants of Chamaecyparis lawsoniana ‘Ellwoodii’, Weigela florida ‘Styriaca’, and Forsythia ‘Maluch’ were sprayed in May with GA3 (800 mg/l), paclobutrazol (400 mg/l), or Atrinal (10 ml/l). In autumn, the rooting of cutting taken from these plants was evaluated. The applied growth regulators did not affect the percentage of rooted cuttings of Weigela florida ‘Styriaca’ or Forsythia ‘Maluch’ when compared with the control, while treatment with GA3 of Chamaecyparis lawsoniana ‘Ellwoodii’ reduced it. Paclobutrazol enhanced adventitious root formation in cuttings of the investigated shrubs, while GA3 and Atrinal did not.

Grzesik M., 1990. Rooting of cuttings taken from ornamental shrubs treated with GA3, paclobutrazol, and Atrinal. Folia Horticulturae II/1: 87-93.