Every fall, a version of the same advice circulates: wrap your evergreens in burlap, spray them with something, and hope for the best. It treats winter damage as one problem with one fix. It is actually two separate problems, and mixing up which fix addresses which is how a shrub ends up both over-wrapped and still eaten.
Winter burn is a water problem. The plant keeps losing moisture through its needles or leaves all winter, and once the ground freezes, the roots cannot replace it. Deer browsing is a food problem. Snow covers everything else deer would rather eat, and your arborvitae is still green and standing there. Fixing one does not touch the other, and by late November, both windows are closing.
What Winter Burn Actually Is
Iowa State University Extension's Yard and Garden program puts the mechanism plainly: narrow and broadleaf evergreens lose considerable amounts of moisture through their needles or leaves during winter, mainly from strong winds and bright winter sun, and once the ground freezes, the roots can no longer absorb water to replace it. Cornell Cooperative Extension of Allegany County describes the same process and adds a detail worth knowing: the damage typically shows up on one side of the plant, usually the side facing the prevailing wind.
That one detail changes how you think about prevention. This is not primarily a cold problem. It is a wind and sun problem happening while the roots are frozen shut. A sheltered evergreen and an exposed one on the same property can end up with completely different amounts of damage for no reason other than which one catches the wind.
The One Step Every Source That Addresses It Agrees On
Water before the ground freezes. Of the sources consulted for this post that discuss watering at all, both agree on this, which is not something that can be said for the rest of the guidance below.
Iowa State's recommendation is to deeply water susceptible evergreens during dry periods in fall and continue watering regularly until the ground freezes. University of Minnesota Extension gives a similar recommendation with a specific month attached: water thoroughly in October until freeze-up, and if fall has been dry, water heavily before the ground freezes to reduce how deep the frost penetrates. The two sources are not stating an identical calendar, Minnesota names October for its own climate and Iowa State just says fall, but the underlying logic is the same either way: a well-hydrated root system going into winter is one of the most controllable factors in how much desiccation damage shows up later.
This is also the step that gets skipped the most, because by the time anyone is thinking about winter prep, it does not feel like watering season anymore. It still is, right up until the ground actually freezes.
Windbreaks and Screens, Placed Correctly
A burlap screen does not work by wrapping a plant. It works by blocking wind from ever reaching the foliage in the first place, which is a different thing.
Iowa State's construction guidance is specific: build a screen from wooden posts, woven wire fencing, and burlap, and set the screen at least six inches from the plant's foliage. Do not wrap the burlap around the plant like a blanket. A shrub wrapped tight in burlap is not protected from wind, it is just wearing a blanket that traps moisture against the foliage instead of blocking the air that dries it out.
Where you place the screen matters as much as building it correctly. University of Minnesota Extension recommends a barrier on the south, southwest, and windward sides specifically, which lines up with the one-sided damage pattern Cornell's extension office describes. You are not trying to enclose the plant. You are trying to block the side that actually takes the wind.
Do Anti-Desiccant Sprays Actually Work?
This is the point where the sources genuinely disagree, and the honest answer is that the evidence is mixed rather than settled.
Iowa State's guidance is cautious in a specific way: it says applications of an anti-desiccant to susceptible evergreens may also be helpful, language that signals limited confidence rather than a firm endorsement. University of Minnesota Extension goes further and states it flatly: anti-desiccant and anti-transpirant sprays are not effective for protecting evergreen foliage. UMass Amherst's Center for Agriculture, Food, and the Environment lands in between, describing anti-desiccant performance as quite variable, to the point where use with any real regularity may not be justifiable, while stopping short of ruling them out entirely.
Three land-grant extension programs looked at the same product category and reached three different levels of confidence in it. That is worth knowing before you pay for a spray application expecting a guarantee.
If you do use one anyway, timing is the part where the sources that discuss it agree, and getting it wrong can cause the exact damage you are trying to prevent. UMass's guidance is specific: wait until December to spray conifers, because the plant needs to be fully dormant, meaning it has already moved water down to the roots, before the coating goes on. Spray too early, while the plant is still moving water into its foliage, and the coating traps that water in the leaves, where it freezes and ruptures plant cells. UMass also specifies application conditions: roughly 40 to 50 degrees Fahrenheit, dry foliage, and no rain in the forecast.
Mulch Solves a Different Problem Than Desiccation Does
Mulch shows up in a lot of winter prep advice next to watering and wrapping, and it is worth being precise about what it actually does, because it is not primarily a desiccation fix.
University of Minnesota Extension recommends a four to six inch layer of mulch to prevent frost heaving by keeping soil temperatures more constant. Frost heave is a root problem, repeated freezing and thawing of the soil surface physically pushes shallow-rooted or newly planted material upward, which can expose and damage roots. It is a real winter risk, especially for anything planted within the last year or two, and mulch genuinely helps with it. It is a separate mechanism from the wind and sun damage covered above, worth doing for a different reason rather than as a substitute for watering or a windbreak.
The Other Threat Is Not Weather, It Is Hunger
Deer browsing has nothing to do with wind or water. It happens because snow covers the deer's preferred food sources and your landscaping is still green, accessible, and standing above the snow line.
An interview with Ohio State University Extension wildlife program specialist Marne Titchenell, published by the New York Times and republished on an OSU Extension county blog, is worth reading for which plants are worth trying to defend with plant selection alone. The piece reports that deer-resistant plant lists warn not to even bother with arborvitae, rhododendrons, or yews, because deer browse them regardless of what else is available. Iowa State's own extension guidance names much of the same group, listing arborvitae and yews as most susceptible and arborvitae, pines, and other evergreens generally as frequent winter targets. Titchenell makes one broader point directly, in her own words: no plant is safe from deer under all conditions, and a hungry, motivated deer will eat foliage that every deer-resistant plant list says it should avoid.
Repellents are the first thing most people try, and both sources are candid about the limits. Iowa State notes that over the winter months, repellents have limited success at preventing deer browsing because reapplication can be difficult in freezing temperatures, and recommends applying early and often when conditions are dry and above freezing, and changing scents and repellent types regularly so deer do not get used to one and ignore it. Titchenell's assessment, again in her own words, is blunter: if deer are already used to eating your plants, highly motivated animals will ignore repellents.
Fencing is what both sources point to when repellents are not enough. The interview reports Titchenell recommending an eight foot or higher woven wire fence for high deer pressure areas, and a lighter setup for low to moderate pressure: an electrified fence using one or two strands of 17 gauge wire, with strips of aluminum foil dabbed with peanut butter crimped onto the wire so the deer's first contact is with the charged line rather than plain wire. Iowa State, in its own separate extension guidance, describes exclusion fencing generally as the most effective, if often the most costly, method to prevent deer from damaging garden plants, with permanent fencing needing at least eight feet of height. That eight-foot figure and the height Titchenell describes for high-pressure situations line up, though it is worth being clear that one is Iowa State's own extension fact sheet and the other is a wildlife specialist's advice as reported in a newspaper interview, not two equivalent research publications independently converging on the same number.
When to Call Stoll's
We handle fall watering, windbreak installation, and deer protection for evergreens and shrubs in Dover, New Philadelphia, Sugarcreek, Strasburg, Bolivar, and Uhrichsville, matched to which threat your property is actually facing.
Send us a few photos of what you are trying to protect and whether the bigger concern is an exposed, wind-battered planting or a history of deer damage. We will tell you honestly whether a screen, fencing, watering schedule, or some combination is worth the cost for your specific plants, rather than recommending everything at once.
Ground freeze is the deadline for watering and screen placement both. That window is open now and it will not be once winter actually sets in.