January
closes with weather extremes southern Wisconsinites have not experienced in
decades. Intensely harsh winds
accentuated extreme sub-zero temps as people (and plants) struggle to survive.
As we tackled huge snow drifts with
shovels and snow throwers, we likely weren’t thinking of our plants’ root
systems beneath the snow. Often
plant survival depends on a thick layer of “insulating” snow cover to reduce
effects of wind damage and piercing sub-zero temperatures.
Also, a healthy plant (not a weak, stressed
plant) stands a better chance of survival through winter—just like healthy humans!
When spring
arrives in Wisconsin (eventually gentler, warmer spring days WILL come…) our
trees, shrubs and perennials will reveal any damage sustained over winter. Often the deep cold is NOT the problem;
some trees and plants can survive even if their entire root system becomes
frozen.
More problematic are numerous freeze-thaw cycles that springtime
brings.
These alternating patterns
of freezing temps, followed by warmer temps, followed by more freezing temps…
send mixed messages to our perennial plants.
As they emerge from dormancy with blissful sunshine and warmer temps,
they are vulnerable. Dropping below
freezing again can shock these plants, or kill them.
Some prevention methods are effective, but must be done in autumn before bitter cold days arrive. Lightly wrapping large plants in plain burlap fabric can protect against sunscald and windburn. The 3 - 4” layer of shredded hardwood you had placed around plants (to reduce moisture loss and deter weed seeds from germinating) also helps insulate plants’ root systems against freeze-thaw cycles.
Rodent
damage:
Voles (genus: Myodes) are often active in winter beneath the snow. Voles
are rodents related to mice, but not the same; easy to identify
with a flatter face than mice, as well as a shorter tail and smaller ears.
There are more than 150 species of voles throughout the world. Voles are
destructive with tiny “needle teeth” and can easily girdle a tree trunk or
shrub beneath the snow. Voles also
eat succulent roots and roots of ground cover. (I snapped this picture last summer when a vole accidentally found its
way into a mouse trap.)
Voles are often eaten by a variety of owls, so do NOT
place poison to reduce their numbers.
As we enter
February, each day is one day CLOSER to spring!
Keep warm!
M. Lynn
Schmid, Certified Master Gardener
A.A.S. Landscape/Horticulture/Arboriculture
A.A.S. Landscape/Horticulture/Arboriculture
