Douglas Fir:

 

 

• Conifer, evergreen tree, 80-200 ft (24-61 m), crown of young trees conical, dense, become broad flat top with age.  Lower branches drooping, upper ones ascending.  Buds oval-conical, apex pointed.  Needles flattened, radially arranged, 18-30 mm long, 2 stomatal bands beneath.  Cones pendant, woody or semi-woody, 10 cm long, with distinctive 3-pronged bracts ("the two back feet and tail of a mouse"), light brown, mature in one season.
• Sun. Prefers neutral or slightly acid, well-drained, moist soils.
• Hardy to USDA Zone 5-6   (Pacific Coast type, P. menziesii var. menziesii) or Zone 4 (Rocky Mountain type, P. menziesii var. glauca)     
• Native range from Central British Columbia south along Pacific Coast to central California, central Mexico, also Rocky Mountains to Arizona, Texas.  Most important timber species in US.
• The largest of the Pacific Coast type is in Coos County, Oregon, 36 ft (11 m) in circumference and 329 ft (100 m) high!

 

Common problems with Douglas Fir trees:

 

 

Insects:

 

Aphids
Aphids feed by sucking up plant juices through a food channel in their beaks. At the same time, they inject saliva into the host. Light infestations are usually not harmful to plants, but higher infestations may result in leaf curl, wilting, stunting of shoot growth, and delay in production of flowers and fruit, as well as a general decline in plant vigor. Some aphids are also important vectors of plant diseases, transmitting pathogens in the feeding process. A sticky glaze of honeydew may collect on lower leaves, outdoor furniture, cars, and other objects below aphid feeding sites. Honeydew coated objects soon become covered by one or more brown fungi known as sooty molds. Crusts of sooty mold are unsightly on man-made objects, and they can interfere with photosynthesis in leaves. MORE INFO
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Diseases:

 

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