Wednesday, March 22, 2023



In addition to ice dams on the roof and piles of snow within the driveway, horticultural damage is a truth of life throughout northern winters. Surprisingly, there are a lot of ways in which in any other case long-lived vegetation might meet their demise in between rising seasons.

Direct damage from publicity to chilly temperature is the obvious, and because of this, most gardeners and owners take note of maps of plant hardiness zones. These outline the common annual minimal temperature of geographical areas based mostly on years of meteorological information.

The southern corners of Vermont are in zone 5a, the place the common minimal temperature is between 15 and 20 levels F under zero. That’s why some folks name it the “Banana Belt.” Up within the Northeast Kingdom, it’s zone 3b, the place the coldest temperature annually averages 30 to 35 F under.

Avoiding the issue is one technique to stop winter damage to your vegetation. Remember to purchase the hardiest vegetation yow will discover. When choosing species or varieties, by no means select those who aren’t suited on your hardiness zone.

In fact, hardiness zones are based mostly on averages, and that may result in issues as a result of some years are colder than common. That’s why it’s advisable to err on the aspect of warning when selecting plant varieties based mostly on hardiness claims. If attainable, buy vegetation which can be suited to outlive in a hardiness zone colder than yours. In case you should put in”marginally hardy” plantings, attempt to place them in protected areas, the place the winds are diminished by the presence of buildings or by the topography.

Winter circumstances may cause the loss of life of vegetation in some ways. Their tops or roots might freeze or vegetation might dry out when whipped by persistent winds. Typically, roots are heaved out of the bottom by alternate freezing and thawing.

Sunny winter days adopted by frigid nights create speedy temperature variations that basically harm vegetation. Ice storms may cause breakage of stems and limbs. Mice and deer shopping for meals additionally might trigger harm.

What’s a grower to do?

For a lot of useful crops, winter safety is crucial. However defending crops too early can intrude with the plant’s pure skill to regulate for winter or “harden off.” Step one to take for winter safety is to attend, in order that vegetation are given sufficient time within the late fall to correctly harden off.

Don’t apply mulch too early, and don’t apply nitrogen (N) late within the season. An excessive amount of obtainable N, whether or not from fertilizers or manure, retains vegetation succulent within the autumn and will increase susceptibility to winter damage.

Mulching vegetation is a method of stabilizing soil in opposition to freezing and thawing. A thick layer of weed-free natural residue-like straw is finest. As a result of straw has hole stems, it’s a superb insulator.

Leaves additionally can be utilized, but when they mat down, their insulating worth is diminished, they usually might smother vegetation. Mulch needs to be utilized in late November, after a tough frost or two.

When mulching roses, reduce the canes again to 18 inches, encompass with hen wire, and canopy the entire plant to guard shoots in addition to roots. Low-growing perennial flowers, strawberries, and the like are simple sufficient to cowl utterly, however they could require re-covering if the winds blow off the mulch.

For grape varieties that aren’t very hardy, take away the vines from the trellis and lay them on the bottom earlier than mulching. For upright vegetation that can’t be lowered to the bottom, erecting a fence of some form can defend vegetation in opposition to drying winds. Burlap or different materials stretched between posts works properly. So does snow fence. It breaks the wind considerably even when there’s no snow, and works rather well to guard vegetation when there’s snow.

Antidesiccants are supplies that add a protecting coating to plant leaves, serving to them to retain their moisture. These might be sprayed on leaves of some vegetation to scale back the lack of water in winter.

In northern climates, winter damage to vegetation is tough to keep away from. With correct precautions, it may be minimized,however be ready subsequent spring to prune away winter-killed canes and limbs and to take away useless vegetation. These is usually a supply of plant illness if left in place.


By Dr. Vern Grubinger Extension Vegetable and Berry Specialist College of Vermont

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