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| Mulch
can damage shrubs & trees |
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Too much mulch applied
over the root ball or resting against the trunk (see
right photo) can cause problems for trees. Roots often
grow up and into the mulch causing stem girdling roots
which can kill trees (lower photo).
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In addition to causing
problems, mulch can also hide decay and dead spots
on the lower trunk and major roots. Decay in this
portion of the tree can cause stability problems.
Keep mulch about 12 to 18 inches from the trunk.
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Trees with too much
mulch piled on the trunk can develop problems at the
base of the trunk. It is best to keep mulch 12"
away from the base. If you MUST mulch this area apply
no more than about one inch on the soil. As a result
of too much mulch trunk bark can rot, rodents can
burrow resulting in damage to the bark, roots can
grow in the mulch and around the trunk, and roots
are encouraged to cross over each other. These can
cause trees to decline and die. Remove mulch from
near the trunk so it remains dry to discourage theses
potential problems.
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Mulch on root ball
intercepts water, causes problems
Mulch close to trunk causes stem girdling root
Mulch close to trunk causes decline
Mulch close to trunk causes tree death
The good, bad and ugly.
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