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Selecting Plants for Screens and Hedges

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Selecting Plants for Screens and Hedges SELECTING PLANTS FOR SCREENS AND HEDGES EM089E SELECTING PLANTS FOR SCREENS AND HEDGES Table of Contents Part 1: Planning a Living Screen or Hedge . 3 Benefits of Living Screens and Hedges ....... 3 Planning, Design, and Development .......... 4 Space Requirements ........................... 4 Formal or Informal ............................. 4 Deciduous or Evergreen ...................... 5 By Plant Texture ..................................... 5 Charles A. Brun, Regional Horticulture Specialist, College of Agricultural, Human, and Natural Resource Sciences; and Paula Dinius, Urban Wildfire Defensible Space ................... 5 Horticulturist, WSU Chelan County. Winter Hardiness Zones ...................... 5 Published: June 2015 Avoid Invasive Plants .......................... 6 Native Plants ..................................... 6 Part 2: Plant Choices ................................ 6 Dwarf Conifers as Hedges ......................... 6 Abstract Medium Height Conifers for Use as Screens This publication discusses the many benefits of installing screens and hedges and Hedges ............................................. 7 in the home landscape. It also provides information on how to plan layouts, Tall Conifers for Use as Screens including spacing issues, types of design, and the best plant choices for and Hedges ............................................. 9 creating healthy and effective screens and hedges. Shorter Broadleaf Evergreens for Hedges ..............................................10 Medium Height Broadleaf Evergreens for Screens and Hedges ...........................11 Tall Broadleaf Evergreens for Screens and Hedges ............................................12 Shorter Deciduous Shrubs for Hedges.......13 Medium Height Deciduous Shrubs for Screens and Hedges ................................14 Tall Deciduous Trees and Shrubs for Screens and Hedges ................................15 References ..............................................16 Further Reading and Resources ................17 Pollinator Resources ..........................17 WSU EXTENSION • SELECTING PLANTS FOR SCREENS AND HEDGES Part 1: Planning a Living Screen or Hedge “Screens and hedges are [closely spaced] linear strips of vegetation that perform a variety of valuable functions in urban environments” (McPherson 1988). Benefits of Live Screens Figure 1. Emerald Green arborvitae and Hedges (Thuja occidentalis ‘Smaragd’) grows to In designing a landscape, consider 15 ft in height and 3 the need for privacy or blocking the ft in width, making it view of an undesirable vista (Figure 1). a very popular hedge As an alternative to a wall built with plant for screening. wood, plastic lumber, or brick, one Photo by Charles can utilize a range of different plants Brun, WSU to build a living screen or hedge desired. For example, if the objective that will provide years of service. is to buffer cold winter winds, an Benefits of Living Using trees and shrubs for screens evergreen windbreak would be at Screens & Hedges and hedges can provide additional a 90-degree angle to the prevailing • Provide privacy benefits, such as reducing noise, winter wind. blocking wind or dust, conserving • Screen unsightly elements energy, and improving water and air Windbreaks work by building up large quality. They can also define a space, quantities of air on the windward • Buffer against wind create habitat for beneficial wildlife, side of a windbreak, causing the air to • Noise and odor abatement and beautify the landscape (Vaughan rise up and over or around the ends. • Dust reduction 2013). The greatest protection is provided within 2–10 times the height of the • Improve water and air quality To design a screen for noise control tallest tree or shrub and over an • Energy conservation from moderate speed traffic (<40 uninterrupted distance of 10 times mph) in neighborhoods, plant a the height (Wright and Stuhr 2002). • Wildlife habitat row of trees or shrubs with the near The density of the row at maturity • Increase species diversity edge of the buffer within 20 to 50 should be at least 60 percent. Density ft of the center of the nearest traffic can be estimated by the proportion of • Beautify the landscape lane (Bassuk 2009). The height will solid area to open area (Straight and NRCS Conservation Practice Standards, 2010 be determined by line-of-sight safety Brandle 2007). issues for vehicle and pedestrian traffic, overhead utility lines, Living screens and hedges can 2009). For example, if the tallest plant and local ordinances. Strive for a conserve energy and improve in the row is 10 ft, the planting row minimum density of 60 percent at water and air quality. With proper should be placed 20 to 40 ft from plant maturity. Density is the solid planting of trees and shrubs, home the structure, at a right angle to the area presented by foliage and woody energy costs can be significantly prevailing winter wind. parts of the plant. The width of the reduced, with actual savings between row should be 20 ft, minimum, to 15 and 25 percent (Dwyer et al. 1992; Water and air quality are effectively reduce noise levels, and Kuhns 2012; Strine 2004). Provide improved through natural plant twice as long as the distance from summer shade by placing deciduous filtering systems that screens and the noise source (NRCS 2011). When trees on the south, southwest, and hedges provide. Plant leaves exchange choosing plant material, consider west side of the house for maximum atmospheric gases and trap particulate tolerance to dust particle deposition, cooling effects. When leaves fall in matter, thereby appreciably reducing salt spray, and vehicle emissions winter, the trees will let the winter the amount of air pollutants. Tree (Bassuk 2009). sun in. In winter, an evergreen buffer and shrub canopies intercept rainfall planted perpendicular to the wind will by catching and slowing rain before Tree and shrub plantings for wind provide protection from cold winter it hits the ground. This reduces soil or dust buffers should be oriented winds. Locate the planting row at a erosion and runoff volume flowing as close to perpendicular to the distance 2 to 4 times the height of the into waterways (Nowak 2006). prevailing wind as possible for the tallest tree upwind from the building time of year protection is most for effective draft protection (Bassuk Living screens and hedges can provide Page 3 •EM089E • pubs.wsu.edu WSU EXTENSION • SELECTING PLANTS FOR SCREENS AND HEDGES habitat for pollinators and other or informal publication, which focuses on plant beneficial wildlife. All wildlife design; the choices. The mature height and width needs food, water, and shelter to need for listed reflect the generally recognized survive. Screens and hedges can deciduous size of plants grown in the northern In this publication provide one or more of these basic temperate zone of the United States. a bee icon can be or evergreen needs. These data came from university found in the plant plants; the aesthetics of references (Bassuk 2009; Breen 2015; Choose trees and shrubs that will section to identify pollinator-friendly plant texture; Brun 2015; Brand 2015; Detweiler provide year-round nectar, pollen, or species. and, in areas 2006; Kuhns 2015; and Love 2009). fruit resources for food. Pollinators prone to include birds, butterflies, bees, and wildfire, the need for defensible space. Formal or Informal beetles (Webb 2011), so planting flowers in a variety of sizes, shapes, Choosing a formal or informal Space Requirements and colors is important. Use at least hedge or screen depends on the site characteristics and personal choice. three different plant species, each with During the planning and design Consider the maintenance level, space consecutive bloom times throughout phase, it is important to know the available (which allows plants to take the season. square footage of the planting area. their natural form) and the overall Measurements of the planting site Additional pollinator-friendly flowers aesthetics desired. An informal hedge should be considered not only to can be planted in the landscape to can be left to grow naturally or it can supplement habitat needs (Figure 2). ensure adequate plant root soil be selectively pruned using thinning Many of our native bee pollinators volume, but also to ensure enough and heading cuts to maintain desired are ground nesting, so part of the soil available width and height for height and width (Figure 3). With should be accessible and undisturbed. mature plant clearance. Be aware of formal hedges, start with a young For other wildlife, such as birds, overhead utility lines, street visibility, plant to build the structure of the consider branch density, thorns, and sidewalk clearance, and property line hedge and continue to prune on a evergreens for shelter, nesting, and boundaries. This information will regular basis. When building the overwintering sites (Vaughan et al. guide plant selection, the number of structure, prune the top of the hedge 2013). plants needed, and their spacing. One narrower than the base to ensure of the biggest design mistakes made good light penetration. Otherwise, Planning, Design, and is planting species that are too large the lower limbs will de-foliate, Development for the designated area (Mason 2013). thus reducing the desired privacy. Select plant material based on mature Flowering hedges should be pruned It is important to plan the layout of size, with consideration of formal or after the blooms have dropped. a screen or hedge before
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