Colorado Blue Spruce
Look first for stiff sharp four-sided needles and gray-brown furrowed bark, then confirm it in cool stream valleys and moist mountain slopes in the central and southern rockies. Those two clues make Colorado Blue Spruce much easier to identify responsibly in Colorado.
Artwork inspired by John F. Carlson
For Colorado Blue Spruce (Picea pungens), record the whole form before isolating details. For Colorado Blue Spruce, use “Stiff sharp four-sided needles and gray-brown furrowed bark” for the first hypothesis and “Cool stream valleys and moist mountain slopes in the central and southern Rockies” for confirmation.
Place the sighting of Colorado Blue Spruce in context by recording “Cool stream valleys and moist mountain slopes in the central and southern Rockies” and “Evergreen year-round; new pale growth and pollen cones are most evident in spring”. For Colorado Blue Spruce, the detail “fruit, fallen material, and site conditions” makes the observation easier to check.
- Status
- Colorado state tree; secure in native range and widely planted elsewhere
- Best clue
- Stiff sharp four-sided needles and gray-brown furrowed bark
- Colorado habitat
- Cool stream valleys and moist mountain slopes in the central and southern Rockies
Quick guide
- Compare
- Needles by touch-free close view and cone position
- Find native
- Cool mountain drainages rather than ornamental streets
A close field reading of Colorado Blue Spruce
- Check one needle
- Four-sided needles radiate around the twig and end in a stiff, sharp point.
- Read the bark
- Mature trunks develop gray-brown furrows rather than the pale smooth bark of subalpine fir.
- Look for cones
- Papery-scaled cones hang downward, unlike upright fir cones.
- Separate planted trees
- A blue ornamental cultivar outside the mountains is not evidence of a native Colorado population.
Good to know
For Colorado Blue Spruce, repeated quiet observation from one position generally reveals more diagnostic information than following, handling, or repositioning the subject.
Notice these
- Stiff sharp four-sided needles and gray-brown furrowed bark
- Cool stream valleys and moist mountain slopes in the central and southern Rockies
- Colorado state tree; secure in native range and widely planted elsewhere