Common Name: Colorado spruce
Type: Needled evergreen
Family: Pinaceae
Zone: 3 to 7
Height: 2.00 to 6.00 feet
Spread: 4.00 to 10.00 feet
Bloom Time: Non-flowering
Bloom Description: Non-flowering
Sun: Full sun
Water: Medium
Maintenance: Low
Leaf: Colorful, Evergreen
Other: Winter Interest
Tolerate: Rabbit, Deer, Drought, Air Pollution
Culture
Easily grown in average, acidic, medium moisture, well-drained soils in full sun. Tolerates some light shade. Prefers rich, moist soils. Although established plants have some drought tolerance, soils should be kept consistently moist and not allowed to dry out in the early years. Generally prefers cool climates and will struggle in the heat and humidity of hot summer climates (including St. Louis).
Noteworthy Characteristics
Picea pungens, commonly called Colorado spruce (also blue spruce), is a medium to large, narrow, pyramidal conifer with horizontal branching to the ground. It typically grows 30-60’ tall in cultivation, but may reach 100’ or more where it grows naturally. It is native to the central Rocky Mountains from southern Montana and eastern Idaho south to New Mexico where it is typically found growing in moist locations from 6000 to 11000 feet in elevation. Stiff, bristly, four-angled, green to blue-green to silver-blue needles (to 1.5” long) point outward from the branches in all directions. Cylindrical light brown cones (to 4” long) have flexible scales. Dark gray bark furrows on mature trees. From a horticultural standpoint, trees with blue or silver blue foliage are generally more coveted than trees with green foliage.
Genus name is reportedly derived from the Latin word pix meaning "pitch" in reference to the sticky resin typically found in spruce bark.
Specific epithet means sharp-pointed in reference to the needles.
'Pendula' is a dwarf, weeping, blue needled form that can be grown in a variety of different ways. If staked, the branches will weep downward. If unstaked, the branches will sprawl along the ground. Staked forms are often grown to 6' tall. Unstaked forms typically rise to 1-2' tall but trail along the ground to 8-10' or more.
Problems
Susceptible to needle cast, cytospora canker, and rust. Watch for aphids (particularly spruce gall aphids), scale, budworms and bagworms. Spider mite invasions can cause significant problems with new growth and overall tree health.
Uses
Weeping blue needled evergreen makes an excellent landscape specimen/accent. May be trained into a variety of shapes or simply allowed to trail along the ground.