Cuttings from secondary branches of Rhododendron Simsii, Cupressus sempervirens, Bougainvillea spectabilis and Thuya occidentalis were collected in October in Jaboticabal, São Paulo. Following treatment with the root-promoting compound, Exubérone, at 0, 10, and 20 ml/1, the cuttings were planted and observed in order to determine the number of stems rooted and the average fresh weight of the roots. The results obtained after 80 days permit the conclusion that the different ornamental species responded differently to a given concentration of Exubérone. The rooting response, in order of decreasing effectiveness, was as fallows: Cupressus sempervirens (20 ml/1), Rhododendron Simsii (10 or 20 ml/1), Bougainvillea spectabilis (10 or 20 ml/1), and finaly Thuya occidentalis (20 ml/1).