Effects of IBA, cutting type and rooting media on rooting of Rosa centifolia

Treatment of semi-hardwood cuttings of Rosa centifolia with the auxin indolebutyric acid (TEA) was found to promote rooting. Percentage rooting, root number and root length were enhanced when cuttings were treated with 3500 ppm IBA in a 0.03% solution of potassium hydroxide. Medial and basal cuttings gave a better rooting response than apical and sub-apical cuttings, suggesting that cutting origin may be important for the rooting performance of this species. Rooting percentage and root length appeared to be improved if cuttings were planted in peat:perlite:vermiculite medium as compared with peat:perlite or vermiculite alone. The interaction between IBA concentration, cutting type and media was found to enhance rooting percentage and root number but not root length.