![]() Columnar Trees and Storm DamageĬolumnar trees are often more prone to storm damage. Ideally, pruning should be done in the late winter or early spring, prior to budbreak. Pruning for narrow trees is undertaken mainly to correct structural defects, like co-dominant trunks or to remove lower branches. Wood mulch has been found to beīeneficial to tree growth and health and doesn’t compete with the tree for Plant material (including turf) or rocks. Recommended that wood mulch be used at the base of trees, instead of Culture and MaintenanceĪll trees will benefit from regular water during establishment. Though trees are narrower in shape, it doesn’t mean they are drought resistant (unless stated). Water is paramount to overall tree health and establishment. Do not plant trees that have low-water needs in heavily irrigated lawn areas or at the base of slopes. Plant trees with higher water needs in areas that can be easily irrigated during periods of drought. Species vary in water requirements and this needs to be accounted for during the tree selection process. For detailed planting instructions, refer to CSU Extension Garden Note #636 “Tree Planting Steps”. Ensure the large structural roots are at soil grade. The root flare should be visible following planting and slightly above grade. planting, dig a saucer-shaped hole approximately three times the Be sure to plant for the mature height and width of the tree (refer to Table 1). Check for obstructions from buildings or fences and overhead utility lines. Select a tree species with a mature size that fits your available space. Young as they mature, the form may widen. The narrow form of trees is most pronounced when trees are These selections are propagated asexually through graftingĪnd cuttings. Many columnar selections have been made from naturally occurring narrow species. There are also trees with pendulous forms that grow upright but have some drooping or weeping branches. Species can have interesting forms, textures, shapes, fall color, fruit, flowers, and bark. These species have varied forms and shapes, from stovepipe to light pole appearances. These trees are more narrow than wide, with a ratio of height to width of 5-to-1 or greater. The terms “columnar” and “fastigiate” are generally used interchangeably. How to Select Columnar and Fastigiate Trees Narrow, columnar, and fastigiate trees are great options to enjoy the beauty and environmental benefits of trees and fit into smaller spaces. Often, columnar trees can be used to make a statement and provide interesting forms and textures.Įveryone enjoys the beauty of shade trees, but many Colorado landscapes are too small to accommodate large trees.Trees with narrower forms can be evergreen or deciduous.Columnar and fastigiate tree forms provide the benefits of larger trees, and can fit into smaller landscapes.Trees provide shade, beauty, and protection from harsh winter winds.By Eric Hammond, James Klett, and Alison S.
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