GUELPH – According to University of Guelph arboretum expert Alison Morrison, this year’s record breaking snow could be a boon for tree health.
“Snow provides insulation for plants and soil as it helps regulate the temperature below it,” said Morrison, an Ontario Agricultural College (OAC) trained horticulturist and certified arborist, who explains in a press release that snow is an often overlooked partner in tree resilience.
“By insulating the ground, snow prevents the soil from freezing too deeply and shields tree roots from extreme cold and exposure,” she said. “It can also act as a natural barrier against winter winds, helping to prevent desiccation (drying out) of tree branches and needles.”
“Many of the trees in our forests and planted landscapes are adapted to handle much colder than this.”
More importantly, snow is a future water source, percolating into the soil as it melts and fueling the tree for bud development. Snow also plays a key role in reducing the activity of harmful pests that could otherwise threaten tree health come spring.
But the winter conditions have to be right, Morrison noted. Trees are best suited to winters with steady cold temperatures and consistent snow cover, keeping them well-protected and hydrated and building their resilience for the year.
“Fluctuating freeze-thaw cycles can stress trees, damaging their bark and roots,” said Morrison. “A consistent cold keeps trees dormant and safe from premature budding, which could be ruined by a late frost.”
Winter is a good time to learn about trees
According to Morrison, Winter provides the best time to learn about trees, offering unique opportunities to focus on details otherwise hidden during other seasons.
“Without leaves, the structure of trees is much more visible,” said Morrison. “You can study their branches, buds and bark, which are key for identifying species.”
The Arboretum hosts workshops and guided walks during the winter months, teaching participants how to identify trees and understand their dormant state.
To learn more, visit www.arboretum.uoguelph.ca/educationandevents/workshops for upcoming workshops on winter tree identification.
