This study was carried out at the Ornamental Horticulture Department, Faculty of Agriculture, Cairo University during two successive seasons; 2006 and 2007 aiming to find out the effect of NAA and IBA at 0,500, 1000 and 1500 ppm on rooting and growth parameters of Populus euramericana and Populus nigra cuttings. The results on Populus euramericana cuttings showed that NAA at 500 ppm gave the highest values of rooting percentage, number of roots/cutting, root length/cutting, fresh and dry weights of roots/cutting ,plant height (cm), number of leaves, fresh and dry weights of leaves /cutting. Whereas, NAA at 1000 ppm gave the highest values of stem diameter, fresh and dry weights of stem in both seasons.On Populus nigra cuttings the data indicated that IBA at 1000 ppm gave the best results of rooting percentage, number of roots/cutting, root length/cutting, fresh and dry weight of roots/cutting, plant height (cm), number of leaves; stem diameter, fresh and dry weight of leaves /cutting, fresh and dry weights of stem during the two seasons.