White Spruce

White spruce (Picea glauca) is a large, native conifer with a regular pyramidal shape. Its stiff, persistent blue-green needles release an aromatic scent when crushed. Small, pendulous cones, green in summer then pale brown, feed many birds. In a cultivated landscape, this tree generally reaches 12 to 18 m (40 to 60 ft) in height and 3 to 6 m (10 to 20 ft) in width; wild specimens can grow larger. Very hardy in Zone 2, it withstands harsh Canadian winters. Its dense habit is suitable for large properties, screens, windbreaks, and naturalized plantings where its mature volume can develop freely.

Choose a sunny or lightly shaded, cool, and well-ventilated location. White spruce tolerates clay and a range of pH levels, but prefers fertile, cool, well-drained soil. Avoid standing water, constantly soggy depressions, and areas exposed to de-icing salt. Dig a wide hole without burying the root flare, water deeply, then apply 5 to 8 cm (2 to 3 in) of mulch, keeping the trunk clear. Maintain regular moisture during the first two seasons. Growth is often slow initially, then becomes moderate once the tree is well-established and receives sufficient light.

When planting, plan for the space a large tree will need rather than relying on pruning to limit its height. Only remove dead, broken, or rubbing branches and preserve the central leader. Surface roots benefit from uncompacted soil and moderately renewed mulch. Monitor for spider mites, aphids, adelgids, scale insects, cankers, root rot, and needle diseases, especially when the tree is subjected to drought, reflected heat, or poor drainage. This native species provides persistent cover, perches, and seeds for wildlife. It is particularly useful in a mixed screen or a large composition inspired by the boreal forest.