One and two-year-old white spruce seedlings growing in trays in the laboratory were immersed in water for periods of 3½, 7, 10½, and 14 days. Total mortality resulted from the 14-day immersion period, but a small percentage of seedlings survived the shorter periods and even repeated immersions for 3½-day periods. Two-year-old seedlings were more tolerant of flooding than one-year-old seedlings. The lelation of thes results to flooding of scarified seedbeds in the B-18a Mixedwood Section of Alberta is discussed.