Designing Windbreaks - May 15, 2013
Jeff Schalau, Agent, Agriculture & Natural Resources
University of Arizona Cooperative Extension, Yavapai County


Creating a windbreak around your home or ranch will not only make the protected area more pleasant during windy periods, it will provide privacy, save on household energy consumption, and create favorable microclimate in the wind sheltered zone. The windbreak need not be created using live plant material. On small, residential properties, a well-designed, strategically placed fence may be a better choice due to space limitations. If you choose to use a living windbreak, then it is best to plan before you plant. Some important considerations include: water availability for irrigation, plant size and spacing, pests and diseases, wind direction, aesthetics, and plant species.

Wind is a mass of air moving horizontally in response to changes in atmospheric pressure. As wind blows against a windbreak, air pressure builds up on the windward side (the side towards the wind), and large quantities of air move up and over the top or around the ends of the windbreak. Windbreak structure - height, density, species composition, length, orientation, and continuity - determines it's effectiveness in reducing wind speed and altering the microclimate.

Windbreak height is the most important factor determining the downwind area protected by a windbreak. On the windward side of a windbreak, wind speed reductions are measurable upwind for a distance of 2 to 5 times the height of the windbreak. On the leeward side (the side away from the wind), wind speed reductions occur up to 30 times the height of the windbreak downwind of the barrier.

The reduction in wind velocity behind a windbreak leads to a change in the microclimate within the protected zone. Temperature and humidity levels usually increase, decreasing evaporation and plant water loss. Soil temperatures in sheltered areas are usually slightly warmer than in unsheltered areas. Taking advantage of these changes in microclimate may allow earlier planting, increased production, and growth of plants that would normally be marginal in your area.

The prevailing wind direction in our area is from the southwest. This may vary depending on adjacent topography, vegetation, and structures. Once you have lived in the area for a while, you know where the prevailing winds blow. It is very helpful to create a scale drawing of your property that includes structures and existing vegetation beforehand.

The decision to use living plants or build a fence is largely a function of space. You may think that cost is a consideration, but this is not always true. Plants may be just as costly in the long run and you will have to wait for them to grow before they effectively reduce winds. Green plants may be more attractive, but they require maintenance and do not create and effective barrier to animals like javelina, rabbits, and deer.

Design and composition of a living windbreak depends on the space available and the species and size of trees. You should seriously consider planting several species of trees and shrubs in a windbreak. Fast growing trees such as willows and cottonwoods can be removed once slower growing species reach adequate size.

Plant species diversity is also a good strategy to minimize insect and disease problems. Remember that Arizona cypress can have bark beetle problems when under-irrigated and Elderica pines have disease problems in Sedona. Other evergreen tree species to consider are Japanese black pine, live oak, or juniper. Deciduous trees such as cottonwood and willow will not live long, but will provide quick growth. Longer-lived trees such as black locust, honey locust, mulberry, and Chinese pistache would function well in a windbreak. Mesquites are not very tall, but will survive without irrigation after establishment. Evergreen shrubs such as Photinia and Nandina could fill in gaps between trees. Use your imagination and create the perfect combination of living and constructed features for your unique situation.

Windbreaks also provide thermal protection for livestock, wildlife habitat, and fire wood. For technical information about designing windbreaks, see the publications linked to the web version of this column (see URL below).

Follow the Backyard Gardener on Twitter – use the link on the BYG website. If you have other gardening questions, call the Master Gardener help line in the Camp Verde office at 928-554-8999 Ext. 3 or e-mail us at cottonwoodmg@yahoo.com and be sure to include your name, address and phone number. Find past Backyard Gardener columns or provide feedback at the Backyard Gardener web site: http://cals.arizona.edu/yavapai/anr/hort/byg/.

Additional Resources
Windbreak Benefits and Design, Utah State University Cooperative Extension, Utah Forest Facts
http://extension.usu.edu/files/publications/publication/NR_FF_005.pdf


Farmstead Windbreaks: Planning, Iowa State University Extension
http://www.extension.iastate.edu/Publications/PM1716.pdf


Planning and Planting a Five-Row Windbreak, Idaho Forestry, Wildlife and Range Experiment Station
http://www.uidaho.edu/~/media/Files/Extension/Forestry/Forest%20Management/Silviculture/Plan%20and%20Plant%205%20row%20windbreak.ashx


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Arizona Cooperative Extension
Yavapai County
840 Rodeo Dr. #C
Prescott, AZ 86305
(928) 445-6590
Last Updated: May 9, 2013
Content Questions/Comments: jschalau@ag.arizona.edu
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