Vegetative propagation of Juniperus excelsa Bieb. (Greek juniper) aims at the conservation of genetic material and the use for reforestation of species of ornamental value adapted to the environmental conditions of the Mediterranean. Studies were conducted to investigate: the effect of auxin treatment, collecting date, crown position and age of ortet on rooting of stem cuttings. The cuttings were collected from native plants, grown under forest environmental conditions, treated with IBA and planted in a mixture of perlite and peat (2:1 v/v) for rooting in fog. Application of IBA had a strong influence on rooting percentage, root number and length with best results at 4 g l^-1. The season of cutting collection also affected rooting. The best rooting was observed in autumn and winter. Moreover, in material collected from young or mature mother plants from three crown positions (lower, middle or upper part), it was found that cuttings of young trees rooted better than those of mature trees in which the crown position of collected cuttings influenced rooting.