Picea pungens (Colorado Blue Spruce) is a species of coniferous evergreen tree native to the Rocky Mountains of North America. It is widely cultivated for its striking blue-gray foliage and attractive conical shape.
The Blue Spruce is a medium to large-sized tree that can reach a height of 15 to 30 meters (50 to 100 feet) with a spread of about 6 to 9 meters (20 to 30 feet). It has a dense, conical crown with horizontal branches that often curve upward at the tips. The tree gets its name from the blue-gray to silvery-blue color of its needles, which are sharp and stiff. The cones of the Blue Spruce are cylindrical, about 7 to 13 centimeters (3 to 5 inches) long, and light brown in color.
Foliage: The Blue Spruce is known for its unique blue-gray foliage, which sets it apart from many other evergreen trees. The needles are four-sided, approximately 2.5 to 5 centimeters (1 to 2 inches) long, and arranged in a spiral fashion around the branches. The blue color is due to a waxy coating on the needles that helps protect the tree from cold and dry conditions.
Cold Hardiness: The Blue Spruce is highly cold hardy and can tolerate harsh winter conditions. It is adapted to thrive in cold mountainous regions and can withstand temperatures well below freezing. It is hardy in USDA hardiness zones 2 to 7, making it suitable for a wide range of climates.
Landscape Use: The Blue Spruce is widely planted as an ornamental tree in landscapes and gardens for its attractive appearance. It adds a splash of vibrant color and texture to the surroundings. Its conical shape, dense foliage, and blue-gray color make it a popular choice for creating focal points, windbreaks, hedges, or privacy screens.
Maintenance: Once established, Blue Spruces require minimal maintenance. Adequate watering during dry periods and regular mulching around the base of the tree to conserve moisture are important. Pruning is generally limited to removing dead or diseased branches and maintaining a desirable shape.
The Blue Spruce is a beloved tree for its stunning blue foliage and suitability for cold climates. Its visual appeal and adaptability make it a popular choice for both residential and commercial landscapes.
Botanical Name : Picea pungens
Common Name : Blue Spruce
Height : 90-135 ft
Spread : 60 ft
Germination Info : No pre-treatment required
Hardiness zone : 3-7
Average seed per ounce : Approx. 6875