Abstract: Ornamental plants like; Rosemary, Hedera, Syngonium and Gadenia are difficult to root without using a rooting hormone. So, this research was aimed to find out the optimum Auxin (NAA) hormone concentration on cuttings rooting of these plants. Six Auxin treatments (0, 1000, 2000, 3000, 4000 and 5000 ppm NAA) were used in a Completely Randomized Design (CRD) with four replicates. Results obtained showed that rooting was improved by the use of the different Auxin concentrations in compare to the control treatment; 3000 ppm NAA was resulted in the highest rooting percentages of the Rosemary and Hedera cuttings, while best results were obtained by 4000 and 1000 ppm NAA in Gardenia and Syngonium cuttings, respectively. Otherwise; callus results are opposite to that of rooting percentage in most NAA treated cuttings.