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Blue Spruce: Picea pungens
The Blue Spruce, also called the Colorado Spruce, takes its name from its silvery blue needles (although color can vary to dull green). Although these trees can be towering in the western forests, they tend to reach 30 to 60 ft. in landscape plantings, with a 20 ft. spread. The needles are rather sharp and stiff. Branches extend all the way to the ground. The Blue Spruce has been a popular landscape plant for decades, and there are many cultivars.
Blue Spruce trees require sun and generous amounts of water, though they can survive drought. They grow best in neutral to slightly alkaline soil.
There are a number of pests, such as spruce adelgids and mites that can damage Blue Spuce. There are several fungi that target these trees as well.
Advice from the arborists at Almstead:
Although there are many pests and diseases associated with Blue Spruce trees, few of them do much damage to a healthy well-watered tree. Seasonal inspection for signs of damage is a good idea for these trees; when signs of potentially serious problems, such as spider mites or cankers, are identified, your Almstead arborist can take preventive measures such as pruning and spraying. Left untreated, these problems could cause unsightly damage to the tree, or even death.
Bottom: Andy Mabbett at the English language Wikipedia
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