Green spruce, also called Colorado spruce (Picea pungens), grows 50 feet high and 20 feet wide, generally. It can grow up to 75 feet tall in the wild, but often only grows 30 feet tall in landscapes. This plant's foliage is dense and ranges in color from dull green to blue-green. Green spruce grows in USDA zones 4 to 7, which means it will survive best in all but the hottest and coldest regions of the United States. Knowledge of how to care for this spruce will keep it healthy and disease-resistant.
Plant the green spruce in an area with full sun and moist, acidic, well-drained soil. This tree can withstand partial shade as well as clay soil that is occasionally wet, but will resist disease best in well-drained soil and full sun. Dig a hole for the plant twice the width of the root ball and at a depth the same height as the root ball so that the roots can spread.
Water the tree deeply and slowly after planting. Continue watering, keeping the soil around the tree slightly moist until the tree starts to take root and grow on its own. After this point, green spruce can survive mostly on rainwater, but needs a little moisture in times of drought.
Fertilize the green spruce only if it shows a deficiency. This plant will normally survive on its own nutrient reserves. If the needles are turning brown, an application in early spring of a complete fertilizer marked 10-10-10 will help the tree. Follow the directions on the package for application instructions.
Prune the green spruce trees as they grow larger and the branches droop in the way of pedestrians and vehicles. This tree does not need pruning to maintain shape, only to keep out of the way. Sterilize your pruning shears with a rag and rubbing alcohol before using them.