Sitka Spruce (Picea sitchensis) &ndash; Medium Sitka Spruce is a large evergreen tree growing 5070 m tall! By far the largest species of spruce, and the third tallest tree species in the world! The crown is broad conic in young trees, becoming cylindric in older trees! The shoots are very pale buff-brown, almost white, and glabrous (hairless) but with prominent pulvini! 100% Guaranteed!