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Avoiding Tree and Utility Conflicts
Determining where to plant a tree is a decision that should not be taken
lightly.
Many factors should be considered prior to planting. When planning what type
of tree to plant, remember to look up and look down to determine where the tree
will be located in relation to overhead and underground utility lines. Often, we
take our utility services for granted because they have become a part of our
daily lives. For us to enjoy the convenience of reliable, uninterrupted service,
distribution systems are required to bring utilities into our homes. These
services arrive at our homes through overhead or underground lines. Overhead
lines can be either electric, telephone, or cable television. Underground lines
include these three plus water, sewer, and natural gas. The location of these
lines should have a direct impact on your tree and planting site selection. The
ultimate mature height of a tree to be planted must be within the available
overhead growing space. Just as important, the soil area must be large enough to
accommodate the particular rooting habits and ultimate trunk diameter of the
tree. Proper tree and site selection will provide trouble-free beauty and
pleasure for years to come.
Overhead Lines
Overhead utility lines are the easiest to see and probably the ones we take
most for granted. Although these lines look harmless enough, they can be
extremely dangerous. Planting tall growing trees under and near these lines will
ultimately require your utility to prune them to maintain safe clearance from
the wires. This pruning may result in the tree having an unnatural appearance.
Periodic pruning can also lead to a shortened life span for the tree. Trees that
must be pruned away from power lines are under greater stress and are more
susceptible to insects and disease. Small, immature trees planted today can
become problem trees in the future. Tall growing trees near overhead lines can
cause service interruptions when trees contact wires. Children or adults
climbing in these trees can be severely injured or even killed if they come in
contact with the wires. Proper selection and placement of trees in and around
overhead utilities can eliminate potential public safety hazards, reduce
expenses for utilities and their rate payers, and improve the appearance of
landscapes.
Underground Lines
Trees are much more than just what you see overhead. Many times the root area
is larger than the branch spread above ground. Much of the utility service
provided today runs below ground. Tree roots and underground lines often
co-exist without problems. However, trees planted near underground lines could
have their roots damaged if the lines need to be dug up for repairs. The biggest
danger to underground lines occurs during planting. Before you plant, make sure
that you are aware of the location of any underground utilities. To be certain
that you do not accidentally dig into any lines and risk serious injury or a
costly service interruption, call your utility company or utility protection
service first. Never assume that these utility lines are buried deeper than you
plan to dig. In some cases, utility lines are very close to the surface.
Proper Places for Trees Around Homes
The illustration above indicates approximately where trees should be planted
in relation to utility lines. Your garden center staff or tree care professional
will gladly help you select the right tree.
Tall Zone - Trees that grow 60 feet (20m) or more in height.
Larger types of trees can be used here; however, you should consider your
neighbor’s view or their existing plantings of flower beds and/or trees. Plant
large trees at least 35 feet (11m) away from the house for proper root
development and to minimize damage to the house or building. These large growing
trees are also recommended for streets without overhead restrictions. Street
planting sites must also have very wide planting areas or medians [greater than
8' (3m)] that allow for a large root system, trunk diameter, and root flare.
Large trees are also recommended for parks, meadows, or other open areas where
their large size, both above and below ground, will not be restricted, cause
damage, or become a liability.
Medium Zone - Trees that grow no taller than 40 feet (12m).
These trees are used to decorate or frame your house or provide a park-like
setting. Select your trees first, then plant shrubs to complement the trees.
Medium-sized trees are also recommended for planting anywhere the above and
below ground growing space will allow for reaching a mature height of 30' - 40'
(10m - 12m). Appropriate soil spaces are: wide planting areas or medians [4'
(1m) - 8' (3m) wide], large planting squares [8' (3m) square or greater], and
other open areas of similar size or larger.
Low Zone - No trees, or trees that grow no taller than 20 feet (6m).
This zone extends 15 feet (4.5m) on either side of the wires. Planting of
trees should be avoided in this zone, and any trees or shrubs planted in this
area should have a
mature height of less than 20 feet (6m). Trees with a mature height of less than
20 feet are also
recommended when the growing space is limited. These trees are also appropriate
for narrow planting areas [less than 4' (1m) wide], planting squares or circles
surrounded by concrete, large raised planting containers or other locations
where underground space for roots will not support tall or medium zone trees.
Some Further Suggestions
Windbreaks
Plant evergreen trees on the west or north side of the house, approximately
50 feet (15m) or more from the house.
Temperature
Plant deciduous (autumn leaf-dropping) trees on the south and/or west side of
the house to cool in the summer and allow sun to enter the house in the winter.
Planning before planting will help you to be sure that the right tree is planted
in the right place. Proper tree selection and placement will enhance your
property value and prevent costly maintenance trimming and damage to your home.
Good landscaping utilizes shrubs and low-growing trees that are compatible with
utility lines. Low-growing trees will not reach utility lines. They will not,
therefore, create public safety hazards or cause service interruptions to you or
your neighbors, nor will they require severe pruning.
For further information on planting and helpful tips on tree selection be
sure to pick up the International Society of Arboriculture publications entitled
New Tree Planting and Tree Selection available at
www.treesaregood.org. If you have any
more questions, please contact your tree care professional, utility company,
local nursery, or county extension office.
Reprinted with permission of the International
Society of Arboriculture
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