Spruce, Colorado Blue
Colorado Blue Spruce Tree Picea Pungens Christmas Tree - Denmark
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Picea pungens var. glauca (Colorado Blue Spruce)
What's Wrong with my Blue Spruce? - American Conifer Society
Picea engelmannii - Wikipedia
Planting out of zone : r/landscaping
Select Blue Colorado Spruce (Picea pungens 'Blue Select') in
10 Alternatives to growing Colorado Blue Spruce in Tennessee