Washington Hawthorn Growth Rate

Growth Rate

• When young, Washington hawthorn grows vigorously and quickly, adding up to 24 inches in height or branch length annually. However, as the tree gets older and larger, the growth rate subsides to a rate that is better considered moderate in comparison. Expect a healthy Washington hawthorn to live 50 to 150 years. Numerous pests and diseases afflict this thorny-branched deciduous tree. Excessive stresses from these problems can limit healthy growth and longevity.

Growth Habit

• A sapling Washington hawthorn looks upright and narrow in silhouette. As new branches are added annually, with the faster growth rate, it soon looks more oval to vase-shaped. One of the main features of these species is development of tiered branches. As the branches spread outward, the overall shape of the leafy canopy becomes more rounded and slightly spreading. Some trees may naturally maintain a slender, rounded habit.

Growing Conditions

• Although tolerant of a wide range of soil types and climates, the Washington hawthorn grows its fastest and best in full to partial sun locations in the garden. A slightly acidic to slight alkaline soil pH is ideal, especially if naturally fertile, gritty in texture and enriched with some organic matter. A moist but well-drained soil is necessary to avoid root rot; overly wet and humidity conditions can exacerbate twig and leaf fungal diseases. This tree is native to the hot, humid summer regions of the Southeast, but performs better in areas with cooler summers.

Shortcomings

• Washington hawthorn trees typically retain their lowest branches, which first appeared when the tree was young. This feature makes them useful as screening hedges, but not as street or garden trees. Since the branches are lined with large, vicious thorns, these low branches need to be pruned away to create a classic, lollipop shape to the tree. The rapid growth rate when young also leads to many branches with narrow-angled crotches with embedded bark, which are weak. Storm winds and the weight load from heavy snow or ice often leads to cracking and branch failure.