The Colorado blue spruce is a beautiful and majestic coniferous evergreen tree. The state tree of both Colorado and Utah, it is native to North America and has attractive, bluish-silver needles, although the exact shade can vary by tree. The cones hang vertically from the branches, are thin and papery, and can reach up to 4 inches in length. The Colorado blue spruce makes an attractive yard specimen or living Christmas tree.
Colorado blue spruce trees prefer a location where they will receive full sunlight. Choose an area that will provide the tree with at least six hours of sunlight per day. In addition, make sure there is room for the tree to grow. The Colorado blue spruce averages around 80 feet tall and 2 feet wide when used in landscapes, although it can grow much larger in the wild.
Colorado blue spruce trees need well-draining soil, or they may develop root rot. Standing water can cause fungi to thrive in the soil and attack the roots of the tree. If the soil is too hard and soggy, work equal amounts of sand, peat moss and perlite into the area surrounding the tree (out to the edge of the tree's canopy) to loosen it up and help the soil drain better.
Water newly planted trees with a soaking hose. Slow, deep watering is best for these trees. Avoid getting the needles wet, as this can lead to the development of fungal diseases. Keep the soil moist through the tree's first growing season. After that, you only need to water during hot, unusually hot and dry periods, or you may not even have to water the tree at all.
Monitor newly planted trees carefully for insects. Young Colorado blue spruce trees will weaken greatly if under stress from a bug attack, although established trees (over 3 years old) are much hardier. While aphids, mites and other insects will not usually kill a young spruce tree, they can weaken the wood enough so that a strong wind or sudden cold snap can kill the tree. Spay the tree with an insecticide if you see bugs infesting the branches.