Picea glauca 'Coerulea' is a broadly conical, upright tree form of black spruce with dense, uniform branching, and exceptionally silvery-blue needles. After 10 years of growth, a mature specimen will measure 6 feet (1.8 m) tall and 3 feet (90 cm) wide, an annual growth rate of 6 to 8 inches (15 - 20 cm).
This cultivar originated as a described unique specimen described in 1866 by John Nelson in Pinaceae: being a handbook of the firs and pines. Based on the passage of time, it's quite likely that this cultivar name has been applied to multiple clones, which should relegate this cultivar to varietal status.
