Colorado spruce (Picea pungens). ‘Glauca is the standard Colorado blue spruce, but ‘Hoopsii’ is even bluer. It its best in colder areas; a poor choice in
Puget Sound region where lack of winter cold leads to severe aphid infestations.
Grows 30 to 60 feet tall in gardens. Zones A2, 3, 1-10, 14-17.