How to Manage and Identify Red Spruce

Red spruce is a common forest tree of the Acadian Forest Region. It is a tree that prefers rich moist sites in mixed conditions and will dominate in a mature forest.

Picea rubens habitat ranges from Maritime Canada south and down the Appalachians to western North Carolina. Red Spruce is the provincial tree of Nova Scotia.

Red Spruce does best on moist, sandy loam soils but also occurs in bogs and on upper, dry rocky slopes. Picea rubens is one of the most important commercial conifers in the northeastern United States and adjacent Canada. It is a medium-size tree that may grow to be more than 400 years old.

Scientific name: Picea rubens
Pronunciation: Pie-see-ah roo-benz
Common name(s): Red Spruce, yellow spruce, West Virginia spruce
Family: Pinaceae
USDA hardiness zones: USDA hardiness zones: 3 to 4A
Origin: native to the North American northeast and higher southern elevations
Uses: Lumber, paper fiber, guitar and piano sounding boards. A unique use of red spruce was spruce gum that was the raw material for a flourishing chewing-gum industry in Maine during the last half of the 19th century and early years of this century.
Availability: Not normally used as a landscaping tree and sold in very few nurseries.

Red spruce thrives in the fog-laden eastern provinces of Canada south into New England, then is limited to high elevation pockets south through the Southern Appalachians to Tennessee and North Carolina.

Red spruce is long-lived and the most characteristic species of the “boreal forest” ecosystem in the Southern Appalachians. At an elevation with almost daily fog, its foliage and branching may take in significant quantities of “fog precipitation” which may make it susceptible to pollution damage.

Picea rubens is very intolerant of fire. Naturally occurring fire is almost unknown in areas where the native tree grows.

Red Spruce is best identified by its large broad crown, with right-angled branches, curving upward at the ends. The bark and twigs tend to be lighter than Black Spruce.

Height: Up to 40 m
Spread: Up to 12 m
Crown uniformity: regular outline or silhouette
Crown shape: narrowly conic
Fruit: Chestnut brown ovoid cone, 1 to 1 1/2 inches long, cone scale margins entire; seed disseminated in the fall and cones tend to drop their first winter.
Growth rate: medium

Air pollution, including both acid precipitation and nitrogen deposition, has been implicated in extensive dieback of red spruce forests in the Appalachian Mountains. Red spruce is considered endangered in New Jersey and Connecticut but experts believe it is not immediately threatened in it's large northern range.

This "red spruce decline" has negatively effected tree growth rates and mortality has increased. The decline is apparently more severe at higher elevations, in older stands, and on more exposed sites. Studies on the causes of red spruce decline have failed to make a definitive case for any single cause.

Red spruce is easily killed by fire due to its thin bark, shallow roots, flammable needles, and lack of self-pruning. Its slow early growth rate delays the formation of a corky layer, which increases the fire susceptibility of young trees.

Surface or ground fires that consume the litter and organic layers covering the superficial roots of red spruce are almost certain to severely injure the roots. Fire kills mature trees by exposing roots, subjecting the tree to water stress and/or windthrow, which may result in the eventual death of the tree. Fortunately, red spruce habitat is not conducive to wildfire.

Red spruce vegetative buds begin growth from May 26 to June 3. Needles are shed early in summer. Reproductive cones open in late April to early May. Red spruce cones mature the first autumn from mid-September to mid-October. Dissemination of seeds begins soon after cones are ripe and continues until March.

Shade Tolerance: Very high
Moisture Preference: High
Soil: Well-drained sandy loam
pH Level: Acid to neutral
Salt Tolerance: Moderate
Pollution Tolerance: Moderate