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Identification Clues:
As with other spruce species, the pyramidal
blue spruce has leaves (needles) that are four-sided, stiff, and arise
singly on the branch. These needles are more pointed and sharper
to the thouch than those of the white spruce varieties. New growth
on blue spruce often has a bluish appearence, hence the species name.
Unfortunately, this characteristic is not consistent; you can find blue
spruce trees that are not at all blue as is demonstrated by the cluster
of three blue spruce trees in front of the Student Union Building.
The blue color is genetic and will not be influenced by the care given
to the tree. The cones range in length from 2 to 4 inches and, like
other spruces, have papery scales. As you can see, the most of the
cones occur at the top of the tree. Because blue spruce are widely
cultivated in nursuries, the species is variable in appearance.
Distribution:
This species, native to the Rocky Mountains,
has been widely introduced in South Dakota for landscaping and use in shelterbelts.
Highlights:
Blue spruce trees provide good cover and food
for wildlife. Flocks of Red and White-winged Crossbills feed on spruce
cone seeds. Many bird species nest or roost within the protection
of the sharp-needled branches. |
