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avoid adding excessive soil or impervious material within the drip line (the entire soil area under branches) of the tree.
Lawn mowers, snow plows, and other lawn and garden equipment can severely injure trunks, branches, and roots of trees. These injuries can be as serious as those caused by heavy construction equipment. The wounds caused by, for example, lawn mowers running into trees, may become the entrance site for injurious fungi or insects.
To prevent accidentally injuring young trees with mowers, grass should be kept away from tree trunks. The grass can be pulled or the sod removed. Chemicals are not recommended to control the grass as tree roots may pick up the material causing injury or death.
Improper pruning is often followed by disease or decay. Pruning cuts should be made just outside the bark ridge where branches join the stem. Long branch stubs permit invasion by decay-producing organisms. Remove injured or diseased branches before they die.
Where branches meet the main stem, a swollen area or collar is usually present. Pruning cuts should not be conducted through the collar; it should remain intact following
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