Primary Goals

• Prevent desiccation and freeze damage

• Maintain stable winter conditions

• Protect trees from physical and animal damage

Winter Protection Guidelines

Mulching & Snow Cover

• Mulch trees with bark, leaves, or garden soil to insulate roots.

• For trees in refinement, protect surface top dressing from displacement.

• Cover trees with snow whenever possible; snow is an excellent insulator.

• Maintain snow cover throughout winter and into early spring as long as conditions allow.

Placement & Shelter

• Position trees in sheltered locations, protected from direct sun and prevailing winds.

• North-facing, sheltered areas are ideal to minimize temperature fluctuations.

• Avoid sites where winter sun may cause premature thawing.

• Ensure that trees and pots are placed directly on the ground. Ground contact allows soil temperatures beneath snow cover to remain stable throughout winter. Trees kept on decks, balconies, or other elevated surfaces lack this thermal buffering and are far more vulnerable to extreme cold. In temperatures approaching –40 °C, such exposure can result in severe root damage and tree loss.

Wind, Rodent & Physical Protection

Use physical barriers to protect trees from:

• Desiccating winds

• Rodents and other animals

• Ensure barriers allow airflow while preventing direct exposure.

Monitoring During Winter Thaws

• Watch for mid-winter warm spells (often late January or early February).

• Thaws can expose tree tops and increase desiccation risk.

• Restore or maintain snow cover promptly if exposure occurs.

• Be alert for snow melt that refreezes as heavy ice: Ice accumulation can bend or break branches. Carefully relieve weight when safe to do so.

Late Winter / Early Spring Caution

• Keep trees covered with snow as long as possible into spring.

• Repeated freeze–thaw cycles during early spring can cause severe root and cambium damage.

• Avoid uncovering trees too early, even if daytime temperatures rise.