The effect of two treatments: Time of taking cuttings and two plant growth regulators IBA and NAA (0, 2000, 4000, 5000 & 8000 ppm) along with two application methods: Talc and quick dip, on three species of old spruce trees (Picea glauca 'Albertiana Conica', P. pungens 'Koster' and P. abies 'Ohlendorfii') were investigated. A factorial in CRD (Complete Randomized Design) base with three replications was employed. The effect of time on rooting, callusing percentage, and root length was accompanied by significant differences. The highest rooting percentage (24.4%) was obtained at 8000 ppm IBA. The highest root length mean was obtained at 5000 ppm IBA with no significant difference observed with 8000 ppm. The highest number of adventitious roots was obtained by applying 5000 ppm IBA with no significant difference observed with 4000, 8000, and 0.5% in IBA Talc. Applying 2000 ppm IBA caused the highest percentage of callused cuttings in "glauca" in mid February.
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