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Blue spruce

Picea pungens


Blue spruce is a medium-sized evergreen tree growing to 82–98 ft tall, exceptionally to 151 ft tall, and with a trunk diameter of up to 5 ft in circumference. The bark is thin and gray, with narrow vertical furrows. The crown is conic in young trees, becoming cylindric in older trees. The shoots are stout, orange-brown, usually glabrous, and with prominent pulvini. The leaves are needle-like, 15–30 millimetres long, stout, rhombic in cross-section, dull gray-green to bright glaucous blue, with several lines of stomata; the tip is viciously sharp.


It grows at high altitudes from 5,740–9,800 ft, though it does not reach the alpine tree-line. It is most commonly found growing along stream sides in mountain valleys, where moisture levels in the soil are greater than the often low rainfall in the area would suggest.


The second photo shows resin sacs - resin used to be harvested from Spruce & used to manufacture pitch.

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Spotted on Oct 24, 2011
Submitted on Oct 24, 2011


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