The Colorado blue spruce (Picea pungens) is a hardy, low-maintenance evergreen tree that displays vibrant silver, bluish-green needle foliage. This highly adaptable conifer reaches 50 to 75 feet tall and 25 feet wide at maturity, forming a slightly pyramidal or columnar shape. The Colorado spruce tree grows best in USDA hardiness zones 2 through 8, where winter temperatures are cooler, withstanding minimum temperatures of minus-45 degrees Fahrenheit. After planting, your Colorado blue spruce trees will need little to no maintenance.
Plant your Colorado spruce trees in an area that receives full to partial sunlight. The Colorado spruce can grow in any soil type.
Plant your trees in early spring or fall. Dig a planting hole that is the same depth as and twice the width of the root ball or nursery container.
Loosen the displaced soil and the soil on the sides and bottom of the planting hole. Set the tree's root ball into the planting hole and plant the tree at the same depth as it was planted in the nursery container, or so that the top of the root ball is about 2 inches below the ground level.
Backfill the planting hole with the loosened, displaced soil. Water the tree deeply and thoroughly to saturate the soil down to and around the root ball.
Spread a 2- to 3-inch layer of bark mulch on the ground around the base of the Colorado spruce tree. Make the mulch ring the same diameter as the lower branches.
Water your trees once or twice each week during the spring, summer and early autumn to supplement rainfall. Water the trees to ensure that they receive about 1 to 1½ inches of water each week throughout the growing season.