Colorado spruce

Colorado spruce (Picea pungens 'Walnut Glen') should be watered deeply but infrequently. In the spring and summer, the plant should be watered deeply about once per week, allowing the soil to dry about 2 inches deep between waterings. During the winter, waterings should be cut back to about once every 2 weeks, making sure the soil is still getting enough moisture to stay healthy. It is important to water at the root level, and not to over-water by allowing the soil to become soggy. In addition to regular waterings, it is recommended to add a 3-inch layer of mulch around the base of the tree. This will help conserve moisture and keep the soil cool in the summer months.

Colorado spruce, also known as Picea pungens 'Walnut Glen', grows best in full sun and requires 6-8 hours of direct, unobstructed sunlight each day. It prefers partial shade in the summer and full sun in the winter. Colorado spruce can tolerate partial shade so it can be grown in areas of the garden which receive dappled or partial shade throughout the day. When planted in an area where the sun’s rays are more filtered, additional sunlight should be supplied with artificial lighting. Sunlight should be directed onto the foliage around mid-morning and last up until mid-afternoon.

Colorado Spruce (Picea pungens 'Walnut Glen') should be pruned in late spring or early summer after it has finished blooming. Prune small branches and trim larger ones to maintain desired shape. Try to keep the natural shape of the spruce and only remove straight branches or overly long growth. Cut away dead or damaged branches, as well as those that cross or rub against each other, to help maintain an aesthetically pleasing shape. Light pruning is recommended, no more than a third of the total growth should be removed in any given year. Pruning can help to maintain the healthy growth of the spruce, however, it is not necessary for the tree to survive.