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University of Tennessee, Knoxville

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Forestry, Trees, and Timber

7-2003

UT Extension Publications

SP611 Trees to Plant under Power Lines

The University of Tennessee Agricultural Extension Service

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611 - 12M - 7/03 R12-4910-034-004-04, https://trace.tennessee.edu/utk_agexfores/56

The publications in this collection represent the historical publishing record of the UT Agricultural Experiment Station and do not necessarily reflect current scientific knowledge or recommendations. Current information about UT Ag Research can be found at the UT Ag Research website. This Trees for Tennessee Landscapes - Choosing the Right Tree is brought to you for free and open access by the UT Extension Publications at TRACE: Tennessee Research and Creative Exchange. It has been accepted for inclusion in Forestry, Trees, and Timber by an authorized administrator of TRACE: Tennessee Research and Creative Exchange. For more information, please contact [email protected].

Agricultural Extension Service

The University of Tennessee

SP 611

Trees to Plant under Power Lines

Tom Simpson
Regional Urban Forester
Tennessee Dept. of Agriculture
Forestry Division
Wayne K. Clatterbuck Associate Professor
Forestry, Wildlife & Fisheries

Serious conflicts often develop between utilities and trees. Trees that grow into electric wires pose serious safety issues and often result in less reliable service. Utility companies spend more than $1 billion annually for tree pruning, passing this cost on to the consumer. In addition, trees are often disÞgured by improper pruning and killed or seriously injured by excavation for underground wires and pipes.
The following table lists suitable tree species for planting near power lines. Each utility may have different requirements for its system. Contact the company if you have any doubt as to its requirements.

Understanding the growth habits of trees and planting the proper species for the location can reduce many of these problems. Any tree planting should include an assessment of space and height restrictions before planting. Underground utilities or building foundation limitations should also be assessed before the tree is placed in the ground. Trees may grow to their full potential and future utility and safety issues will be greatly reduced by selecting compatible trees and positioning them away from utilities. Existing tree/utility conßicts should be considered and the trees replaced where feasible.
Many local utilities already have a tree-replacement program for problem trees. Some utilities will plant the replacement trees, while others may issue nursery vouchers for homeowners to select their own replacement trees. Contact your local utility company to discover its method of replacement.

Figure 1. Pin oaks can grow greater than 70 feet in height and are a poor choice for planting under utility lines.

When selecting trees to plant under or near utility lines, consider the type of line.
Electric lines are commonly installed overhead and are often non-insulated. Service interruption results when branches contact the wires or when trees fall through the wires. No tree that exceeds 25 feet at maturity should be planted under these wires. In addition, trees that mature at greater heights should be spaced at least 25 feet horizontally from the closest wire. Telephone and cable TV lines are typically insulated and distribute much lower voltages but require the same level of planning as electric wires. Trees planted close to underground lines or water lines often cause major root system problems and are subject to serious injury when repairs to these lines are performed.

Figure 2. Redbud mature at less than 25 feet and are recommended for planting under utility lines.

References

Recommendations

Clatterbuck, Wayne K. 2000. Post-planting tree care: fallacies and recommendations. The University of Tennessee Agricultural Extension Service SP 574. Knoxville.

1. Assess area to be planted both above and below ground. 2. Select a tree of small stature that matures at a height less than 25 feet.

Dirr, Michael A. 1998. Manual of Woody Landscape Plants: Their identiÞcation, ornamental characteristics, culture, propagation and uses. 5th ed. Stipes Publishing Company, Champaign, IL.

3. Consider existing utility and gas lines above and below ground.

Gerhold, Henry D., et al. 1993. Street Tree Factsheets. The Pennsylvania State University, School of Forestry Resources, University Park, PA.

4. Contact your utility about recommended species of trees to plant and tree planting programs.

Recommended Trees For Planting Under Utility Lines.

Botanical Name

Acer ginnala

Common Name

Amur maple

  • Height
  • Note

15-20 ft Small tree native to China

Acer palmatum

Japanese maple Tatarian maple Serviceberries Eastern redbud White fringetree
15-25 ft Numerous varieties, colors, forms 15-20 ft B u s h y, s p r e a d i n g t r e e

Acer tataricum Amelanchier spp. Cercis canadensis Chionanthus virginicus

15-25 ft M a n y v a r i eties and hybrids; a few reach 30 ft 20-25 ft S h o w y ßowers, varieties come in many colors 12-20 ft White, drooping ßowers. Native

Cornus ß orida

Flowering dogwood Kousa dogwood
20-25 ft White ßowers, varieties come in different colors

Cornus kousa

20-25 ft W h it e ßowers, varieties come in different colors

Cotinus coggygria Crataegus spp.

Common smoketree Hawthorns
10-15 ft Avoid the American smoketree, which grows to 30 feet 15-25 ft Av o i d Wa s h i n g t o n h a wthorn, which grows to 35 feet 15-20 ft Many varieties & cultivars; common witchhazel grows to 30 feet 10-15 ft An evergreen, used as a barrier in landscapes

Hamamelis spp.

Witchhazel

Ilex x attenuata

Foster holly

Koelreuteria paniculata

  • Golden raintree
  • 20-25 ft Yellow ßowers in late spring, can grow to 35 feet in some

locations

Lagerstroemia spp.

  • Crape myrtle
  • 15-25 ft Many varieties & cultivars. Most grow under 25 feet in TN.

Avoid the "tree" types

Magnolia x soulangiana

Saucer magnolia Star magnolia
20-30 ft Grows smaller than 30 feet in TN. Many varieties, but bold ßowers are susceptible to late freeze

Magnolia stellata

10-20 ft Delicate, white ßowers. Attractive landscape tree

Malus sp.

Flowering crabapples 20-25 ft M a n y o r n a m e n t a l varieties, all colors of ßowers, small fruit that some consider messy. Good wildlife tree

Syringa vulgaris

  • Common lilac
  • 10-20 ft Small tree or large shrub

  • SP 611 - 12M - 7/03
  • R12-4910-034-004-04

The Agricultural Extension Service offers its programs to all eligible persons regardless of race, religion, color, national origin, sex, age, disability or veteran status and is an Equal Opportunity Employer. COOPERATIVE EXTENSION WORK IN AGRICULTURE AND HOME ECONOMICS
The University of Tennessee Institute of Agriculture, U.S. Department of Agriculture,and county governments cooperating in furtherance of Acts of May 8 and June 30, 1914.
Agricultural Extension Service Charles L. Norman, Dean

Printing for this publication was funded by the USDA Forest Service through a grant with the Tennessee Department of Agri- culture, Division of Forestry. The Trees for Tennessee Landscapes series is sponsored by the Tennessee Urban Forestry Council.

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  • Acer Ginnala Amur Maple1 Edward F

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  • Embryo Germination in Acer Ginnala Maxim. and the Activity of an Endogenous Exudate

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