 Douglas
Fir
Pseudotsuga menziesii--Douglas Fir
Hardiness Zones: 4 to 6
Height: 75 ft
Spread: 20 ft
Form: pyramidal
Type: narrow-leaved evergreen tree
Annual Growth Rate: 12 to 18 inches
Comments: A very cold hardy tree, Douglas Fir prefers a sunny location with a moist soil. The soft, bluish-green needles on a tall, narrow spire provide a dominant landscape feature.
Douglas Fir's cones, hanging down from its branches, distinguish it
from the true firs, which belong to the genus Abies
and bear cones that point straight up from the branch. It plays host
to an insect that also feeds on Colorado Spruce, and so should not be
used with that species in the same landscape. Douglas Fir is one of
the most popular Christmas trees, used for its softness, fullness and
long-lasting needles.
Cultivars:
'Fastigiata' - A cultivar with ascending branches.
'Glauca Pendula' - A weeping tree with bluish foliage.
'Graceful Grace' - A narrow plant with drooping branches and long, bluish needles.
'Pendula' - A spreading, slow-growing, weeping tree. 
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