Colorado blue spruce, with its blue-green needles, is a conical evergreen that is cold hardy through U.S. Department of Agriculture zone 4. Capable of reaching heights of 50 feet and a diameter of 20 feet, Colorado blue spruce can be used in the landscape or as a Christmas tree. Colorado spruce can grow well in most soil types and from full sun to part shade. A balled, or ball and burlap, Colorado spruce can be planted in spring, summer or early fall.
Select a well-drained location in full sun to part shade to plant Colorado blue spruce. The tree, when mature, can reach a diameter of 20 feet. The planting location should be free of encumbrances 10 feet in all directions.
Dig the hole as deep as the root ball is tall and at least 1 foot wider than the root ball. In hard clay soils, rough up the sides of the hole with the tip of the shovel to help loosen the soil for better root penetration.
Place the burlap-wrapped root ball in the center of the hole and backfill the hole halfway. Water to settle the soil.
Remove the cord or wire that holds the burlap to the trunk of the tree. Pull the burlap down to expose the top half of the root ball. Finish backfilling the hole and water again.
Apply 2 to 4 inches of mulch, like shredded bark, around the disturbed soil. Keep the mulch about 2 inches away from the trunk of the tree.
Water weekly during the first year until late fall if there is no rainfall.