The effect of IBA, medium and diameter of cuttings on quantity of rooting of ‎Damask rose

One of the most important species of roses is the Damask rose, some of whose cultivars are important for the production of essential oil and others are cultivated as garden roses. In order to investigate effect of indole buteric acid (IBA), growing media and cuttings diameter on the quality of rooting, an experiment was designed a factorial based on randomized complete design with 30 treatments and 3 replications. Treatment contained growing media at 3 levels (cocopeat 30%+perlite 70%, cocopeat 50%+perlite 50% and sand 50%+perlite 50%), IBA concentration at 5 levels (0, 1000, 2000, 3000, 4000 mg L-1) and stem diameter at 2 levels (5-13 and 13-20 mm). Results showed that the survival rate of Damask rose was significantly increased by increasing the concentration of IBA up to 3,000 mg.L-1. The highest number of leaves was observed in 2000 and 3000 mg.L-1 of IBA and more thick cuttings. Interaction between IBA concentration and cuttings diameter in most traits was significant, except for root number. The highest root length, root number, leaf number, viability, and longest root length were observed in culture media 30:70 cocopeat and perlite. According to results, 2000 mg L-1 IBA, thicker cuttings and cocopeat 30%+perlite 70% growing media could be suggested for maximum survival percentage and root density.