Picea pungens 'Blue Stoplight' is an irregular dwarf, flattened-globose selection of Colorado spruce with short, vividly blue foliage and compact growth. After 10 years of growth, a mature specimen will measure 12 inches (30 cm) tall and 16 inches (40 cm) wide, an annual growth rate of slightly more than 1 inch (2.5 cm).
This cultivar originated as a witch's broom found around 1990 by Justin "Chub" Harper on a tree in a traffic intersection in Moline, Illinois. In his notes Chub said that the broom was so nice that it could "stop traffic," hence the cultivar name.
