Mountain Hemlock

Mountain Hemlock (Tsuga mertensiana) should be watered once a week, but the amount of water can vary depending on the season. In the spring and summer, water the mountain hemlock deeply but not frequently. Aim for a total of 1.5-2 inches of water per week, allowing the soil to dry between waterings. In the fall and winter, water the mountain hemlock less often, only when the top few inches of soil feel dry. Aim for 0.5-1.5 inches of water per month. When watering, focus on hydrating the root zone, not the foliage.

Mountain Hemlock (Tsuga mertensiana) requires 6-7 hours of direct sunlight each day during the growing season. This is usually provided from May to August when the sun is at its strongest. During the rest of the year, Mountain Hemlock can tolerate a few hours of morning or afternoon sunlight as long as it is not in excessive amounts. Growth can be poor in overly shaded areas, so placing these trees where they can get at least 6-7 hours of unfiltered sunlight each day is ideal.

Mountain Hemlock should be pruned in late winter or early spring, before new growth begins. Pruning is not usually necessary, but when desired, the tips of branches can be selectively pruned to control the shape or size of the tree. The amount of pruning should be minimal and should not exceed 1/3 of the total leaf area of the tree. To reduce the risk of disease or stress, prune in such a way that no more than 2 or 3 branches are removed from an area. Make sure all tools are clean and sharp to avoid damage to the tree.