Winter Care Guide For Young And Recently Planted Trees

Newly planted trees face their first winter with immature root systems and thin bark.  The freeze thaw cycles, strong winds and hungry wildlife common in Illinois can stress young trees.  Proper winterization focuses on water, mulch, and trunk protection so that the tree’s energy reserves are high and the root zone is protected from temperature swings.

Fall watering

Trees must enter winter well hydrated because dry soil loses heat and roots are more likely to freeze.  If fall weather is dry, gardeners should water heavily before the ground freezes.  Apply 5 gallons of water plus 5 gallons for every inch of trunk diameter for newly planted trees . Water slowly until moisture reaches the entire rootball (typically 8–10 inches deep) and stop when the soil is moist but not soggy.

Mulch: Insulating the Root Zone and Preventing Frost Heaving

Mulch is a simple but critical winterization step.  A 2–4 inch layer of shredded wood or bark chips over the root zone insulates the soil, retains moisture and prevents frost heaving, the freeze thaw cycles that can lift young rootballs out of the soil. Mulch newly planted trees with 3–4 inches of shredded wood and leave a 2 inch gap between mulch and trunk to discourage rot and rodents.

Protecting the Trunk: Sunscald and Animal Damage

Young trees with thin bark are susceptible to sunscald, a condition where the trunk’s south or southwest side warms on sunny winter days and then freezes rapidly at night.  The bark can crack or slough off, exposing the cambium. To prevent this, use white commercial tree wrap or plastic tree guards applied from the ground to just below the first branch and leave it on for at least two winters. 

More Tips

• Stop fertilizing in late summer. Young trees don’t need high nitrogen fertilizer going into winter; excessive late season growth is susceptible to cold injury.
• Remove watering bags after a few weeks.  Tree watering bags can help during establishment, but it is best to remove them in autumn to expose the trunk to air and prevent moisture buildup around the bark .
• Delay pruning until the tree is fully dormant (mid winter) unless branches are dead or hazardous.  Proper pruning removes weak or crossing branches and helps the tree withstand snow and ice.

Conclusion

Winterizing newly planted trees requires attention to water, mulch and trunk protection.  Deep watering during fall builds moisture reserves, while periodic winter watering during warm spells prevents desiccation.  A 2–4 inch mulch layer insulates roots and moderates soil temperature.  Wrapping the trunk reflects winter sunlight and prevents sunscald, and plastic guards keeps hungry wildlife away.  By following these steps, you can help young trees survive their first winter and flourish in spring.