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Deterring Rodents
Temporary winter mulches are necessary for tender shrubs like roses, or any woody plant whose crown must be
protected from winterkill or the predation of rodents. However, if mulch is applied too soon, little critters
like moles, voles or mice may set up house in it. Rodents can girdle or chew bark off the circumference of a
young tree. Bark and cambium are the lifelines between the plant’s roots and its branches; when these disappear,
the tree dies. Applying mulch after freeze up encourages small rodents to select winter quarters elsewhere.
Rodent damage is especially prevalent in fruit-producing trees and shrubs, as well as the tender bark of some
immature landscape plants. Stiff collars made of plastic or wire mesh extending from the ground to above the
snowline will discourage girdling by larger animals such as rabbits.
In the spring, pull back any mulch that is touching bark or covering shrub crowns. Tree wraps, strings, shrub
shrouds and temporary shelters should be removed when all the snow has melted and buds begin to swell.
Planning Is Key
The best means of protecting trees and shrubs in winter are pre-emptive measures. These start with good garden
design. Consider an area’s exposure to prevailing winds, salt, snow and ice accumulations. Select the most
appropriate plants to grow in site conditions that you can’t alter. Proper ongoing maintenance practices such
as selective pruning, mulching and soil care will help keep plants healthy and better equipped to withstand the
rigors of the fourth season.
Chris Marusaik
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