A variety of staking
methods are used to protect, anchor or support young trees. The
extent of staking depends on tree strength and conformation,
expected wind conditions, car and foot traffic, type of
landscape planting and the level of expected follow-up
maintenance. Several types of staking are commonly practiced.
Support staking is used when tree trunks lack sufficient
strength to withstand winds without bending or if bending occurs
the trunk cannot flex back to its original, upright position.
Anchor staking prevents movement of the trunk of the tree
that could cause movement of the rootball or up rooting of
recently planted trees. Even relatively small movement of the
rootball can severely damage new roots growing into surrounding
soil and significantly delay or prevent successful tree
establishment. Protective staking is practiced when there
is concern that maintenance or construction equipment may cause
damage to or kill transplanted trees. All staking practices have
an effect on subsequent growth and development of staked trees.
Staked trees may: grow taller; grow less caliper near the ground
and more near the top of the tree; develop a smaller root
system; offer more wind resistance than trees of equal height
(because the top is not free to bend) and are more subject to
rubbing and girdling from stakes and ties. All these influences
make a tree less able to stand without staking.
Staking may be necessary
to help selected young trees until they get root anchorage or
the tops become strong enough to stand alone. Given the
limitations listed above its clear that staking should be a
SHORT TERM measure used to allow trees to become established.
Actual staking methods and configurations vary widely. Cost,
strength, durability, ease of installation, appearance tree
specie, box size and branch structure are all factors in
selecting a staking method.
Material used to stake
trees include wood or metal stakes and a tying materials that
link the trunk to the supporting posts. Any material used as a
tie should contact the trunk with a broad, smooth surface and
have enough elasticity to minimize trunk injury and girdling.
Polyethylene tape and wire covered with hose or tubing are among
the most common ties used. Brightly colored tie materials are
easiest to locate when ties are later removed. Failure to remove
ties can cause girdling of the branches or trunks. A figure
eight tie looped between the stake and trunk is flexible and
provides extra protection from injury to the trunk from the tie
or the posts. Various staking methods can be employed that use
from 1 to 4 stakes. When two stakes are used, an imaginary line
drawn between the two stakes should be at right angles to the
most critical winds. Post should be strong enough to resist
anticipated winds and tie material flexible enough to provide
support yet give so that trees can develop proper caliper and
taper.
The most common method
currently used employs two stakes with tie loops from each post
to the trunk. Tie are arranged opposite one another to allow
support and some give. With arid landscape trees, staking may be
needed for some standard trunk specimens. Trees with low
branches, multiple trunks or a natural shrub-like growth habit,
generally do not require staking. Staking should be done
selectively and only after careful consideration of the site.
From a horticultural
standpoint, staking should not be a standard practice applied to
all newly transplanted trees. Once trees are established, stakes
and ALL tie materials should be removed to prevent future damage
to the tree. as soon as trees appear established.