The damage happens under the snow, where you cannot see it. Here is how to stop it — and the specification detail that decides whether your barrier works at all.
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In April, the snow pulls back from the base of your young apple tree and you see it: a clean band of bare wood running right around the trunk, the bark stripped away in a neat ring a few inches above the soil.
The tree may still leaf out. It may even flower. And then it may collapse later that summer, or limp through into the following year before failing — because it has been girdled, and a fully girdled tree is running on stored energy it cannot replace.
This is one of the most common ways northern growers lose young fruit trees — extension services consistently name rodents among the leading causes. Not cold. Not disease. Rodents, working all winter in the dark under a metre of snow, at the one time of year you never look.
The good news is that it is almost entirely preventable, the materials cost very little, and the whole job takes an afternoon. The bad news is that most people do it slightly wrong, and slightly wrong is the same as not doing it.
Why a ring of missing bark kills a tree
Just under the bark sits a thin layer of living tissue that carries sugars from the leaves down to the roots. Strip the bark away all the way around the trunk and you sever that pathway completely. The leaves can still photosynthesise, and the roots still have stored energy for a while — which is exactly why a girdled tree leafs out in spring and looks fine. But the roots are now starving, and once their reserves run out, the whole tree fails. That is the summer collapse people find so baffling.
Partial girdling is often survivable. If a meaningful strip of intact bark remains, the tree can pull through — weakened and less productive — and gradually compartmentalise the wound. Recovery depends on how much of the circumference survives, the vigour of the tree, and the species: a tree retaining 20–30% of intact bark stands a reasonable chance, while a very narrow surviving strip may still fail. The completeness of the ring is what decides the outcome.
The detail that makes it worse than it looks
Here is the part most guides skip, and it matters enormously for fruit trees specifically.
Nearly every commercial fruit tree you buy is grafted: a named variety joined onto a separate rootstock, with the union visible as a swelling low on the trunk. Rodent damage happens at exactly that height. (Not everything is grafted — haskap, the University of Saskatchewan’s own-rooted dwarf sour cherries and some seedling-grown trees are not, and for those the stakes are lower: damage below ground level is still serious, but you are not going to lose the variety.)
If a tree is girdled below the graft union, you do not merely lose a season. The rootstock may survive and send up vigorous new growth — but that growth is the rootstock, not your variety. Your Honeycrisp, your Ure pear, your hardy plum: gone. What regrows in its place is typically of little or no value for fruit.
So protecting that lower few inches of trunk is not about protecting a tree in general. It is about protecting the specific cultivar you chose, waited for, and cannot get back.
Know which animal you are dealing with
The three culprits leave distinct signatures, and they need different defences. Reading the damage tells you what to build.
| Animal | Where it feeds | What the damage looks like |
|---|---|---|
| Voles & mice | At the soil line and upward through the snowpack | Small irregular gnaw marks — roughly 3 mm wide — running at varied angles in patches. Surface runways through the grass. Some voles also chew roots underground, invisibly. |
| Rabbits & hares | From the snow surface up to roughly 45–90 cm above it — snowshoe hares reach higher than cottontails | Bark stripped in larger patches, and small branches clipped off in a clean angled cut, as though pruned. Round droppings nearby. |
| Deer | Up to 1.5 m and higher | Ragged, torn browse on tips (deer have no upper front teeth), and in autumn, shredded bark where bucks rub antlers. |
That clean angled cut is the giveaway for rabbits. Deer tear; rabbits slice.
Voles: the ones you never see coming
Voles are small, stocky, short-tailed rodents — the meadow vole is only about 14–19 cm long, the pine vole smaller still. Two facts make them the primary threat in a cold-climate orchard.
They do not hibernate. Voles are active all year, day and night, right through winter. While your garden looks dormant, they are working.
They tunnel through snow, not just soil. This is the crucial one. A vole can burrow through the snowpack itself, which means it can girdle your trunk as high as the snow accumulates. In a deep-snow winter that might be well above where you assumed the danger zone ended — and the whole time, hidden, in a warm insulated tunnel with no predators and nothing else to eat.
They also breed formidably. Populations can reach several hundred per acre in a peak year, with multiple litters through the season. A quiet year and a bad year look completely different, and you do not get advance warning of which one is coming.
The barrier that actually works
Physical exclusion is the most consistently reliable defence. Get the specification right and you dramatically reduce the risk.
Use ¼-inch mesh hardware cloth. This is the single most important specification in the whole job. Quarter-inch hardware cloth on Amazon.ca has openings small enough to exclude voles and nearly all mice. ⚠️ Chicken wire does not work — its holes are large enough for mice and voles to walk straight through. Chicken wire around a trunk provides the appearance of protection and none of the substance.
Bury the bottom edge. Extension guidance ranges from a minimum of 5 cm to a more thorough 15 cm below the soil surface. Deeper is better where vole pressure is high, but do not damage roots getting there — with an established tree, take what depth you can. An unburied cylinder is simply a doorway.
Make it tall enough for your snow, not your summer. This is where most people underestimate. The barrier needs to reach roughly 45–60 cm above your expected snow depth — not above the ground. Standard hardware cloth comes in 60 cm, 90 cm and 120 cm heights; in genuine snow country the 90 cm or 120 cm rolls are the sensible choice, and they give you protection against buck rub as a bonus. Go higher still if your site drifts — a drift is not the same as your average snow depth, and rabbits will happily stand on one.
Leave room for the trunk to grow. Form a loose cylinder with roughly 10 cm of clearance all round, secured with zip ties or wire. A snug wrap becomes a girdling device of its own within a couple of seasons.
⚠️ Handle the stuff carefully. Cut hardware cloth has genuinely vicious edges and the roll snaps back into a coil when you cut it. Use heavy gloves, proper tin snips, and eye protection. This is the one part of the job that reliably draws blood.
The mistake that costs people their trees
Spiral plastic tree guards are sold everywhere, they are cheap, and they take thirty seconds to fit. They are also not adequate as a stand-alone defence against the most common threat you face.
Plastic tubes and spiral wraps designed for rabbits are not a deterrent for voles. Voles work at and below the soil line, and a guard that simply sits on the ground surface gives them clear access underneath. Extension services state this plainly, and it is the single most common false sense of security in winter tree protection.
Spiral tree guards on Amazon.ca genuinely earn their place — they deter rabbits at low heights, they shield thin young bark from sunscald (a separate winter problem worth solving), and they protect against string-trimmer damage in summer. Their weakness is specifically voles. So use them for what they are good at, and use buried hardware cloth for what they are not.
The free half of the job
Barriers stop animals that show up. Habitat management stops them showing up. This half costs nothing and matters nearly as much.
Keep the base of each tree clear. Voles need cover — they will not cross open ground readily, because that is where hawks and owls are. Aim to keep vegetation cut back roughly 30–60 cm around each trunk; a bare or closely mown collar is genuinely protective, and long grass right up to the bark is an invitation.
Pull mulch back from the trunk. Mulch is good for your trees and excellent for voles. Keep it to about 5–10 cm deep and pull it back roughly 15 cm from the bark, so there is a clear collar of open ground. ⚠️ A mulch “volcano” mounded against the trunk is close to purpose-built vole habitat: warm, hidden, and immediately adjacent to the food. A doughnut, not a volcano — the same rule we give in our cold climate food forest guide.
Time your last mow deliberately. Cutting the orchard floor short in late autumn, as close as practical to the first lasting snowfall, strips away the cover voles are relying on just as they settle in for winter. A tidy September mow followed by six weeks of regrowth achieves considerably less.
Clean up overwintering cover. Prunings left in rows, old boards, rock piles, stacked pots and brush heaps are all winter shelter. Clearing them in autumn removes habitat at exactly the moment it becomes valuable to a rodent.
Tramp the snow after big storms. This one is an old orchard trick and it costs nothing: walk a firm circle around each trunk after heavy snowfall. Compacting the snow collapses the tunnels voles use to move and feed under cover, and makes the area around your trees considerably less comfortable for them.
Clean up fallen fruit. Windfalls left under the tree through autumn concentrate rodents exactly where you least want them, right before the snow arrives to hide them.
Move brush piles away. Brush, woodpiles and long rough grass are rabbit habitat. Keep them well clear of your young trees rather than adjacent to them.
Encourage predators. Hawks, owls, foxes and weasels all suppress vole numbers, and a raptor perch near an orchard is a cheap, permanent piece of control that works while you sleep. ⚠️ Predators reduce populations but will not prevent an outbreak — treat this as support for your barriers, never a substitute.
When to do it — and when to undo it
Install in autumn, before the ground freezes. You need workable soil to bury the bottom edge, and you want the barrier standing before the first significant snow. Waiting until you see damage means waiting until spring, and by then it is done.
⚠️ Inspect every guard each spring — and know which type you have. This is where advice varies, and the distinction matters:
- Loose hardware cloth cylinders with proper clearance can generally stay in place for several years. They are a cage, not a wrap, so they do not constrict anything — provided you check annually that the trunk still has room and enlarge or replace the cylinder as it thickens.
- Snug wraps, plastic spirals and solid tubes should be loosened or removed. These sit against the bark, and a tree that outgrows one will be constricted by the very thing meant to protect it.
Either way, spring inspection is the non-negotiable part: clear out debris, confirm the trunk is not touching the barrier, and adjust. ⚠️ And if you do remove something, put a note in your calendar for October. A guard sitting in the shed all winter protects nothing, and forgetting to replace it is a more common failure than outgrowing it.
One further caution on solid plastic tubes specifically: left on continuously they can trap humidity against the bark, harbour insects, and encourage soft, weak growth. They are more of a seasonal tool than a permanent fixture.
One extra winter task in deep-snow country: after a heavy snowfall, walk the orchard and check that your barriers still stand well above the new snow line. If drifting has buried them, rabbits are now standing at a fresh height with unprotected bark in front of them.
Which trees they go for first
Anything young is at risk, because thin bark is easier to chew. Fruit trees — apples, pears, plums, crabapples — are consistently among the most damaged, which is unfortunate given they are also the expensive part of a food forest.
Thin-barked species like willows and poplars are heavily favoured, and low shrubs get chewed on their undersides where snow gives cover. If you are triaging limited time and materials, protect grafted fruit trees first — they are the ones where damage below the union costs you the cultivar outright.
One detail worth knowing if you have bought dwarf trees: trees on dwarfing rootstocks tend to suffer worse. They have slimmer trunks, thinner bark, and less stored energy to fall back on, so the same amount of chewing represents a larger proportion of the circumference and a smaller reserve to survive on. If your orchard is a mix, the dwarfs are the ones to protect first.
If it has already happened
Find the damage in spring and the first job is to assess how complete it is. Look carefully for any intact bridge of bark, however narrow.
Partial damage: leave it alone. Do not paint it, seal it, or wrap it. Keep the tree watered and unstressed, ease off on heavy fertilising, and let it compartmentalise the wound itself. Many trees recover from surprisingly ugly injuries.
Complete girdling above the graft: the top is unlikely to survive long term. There is a specialist repair — bridge grafting, in which scion pieces are grafted across the wound to restore the connection — but it is a skilled job, it must be done in early spring while the damage is fresh (success falls away sharply the longer you wait), and it is realistically for valuable mature trees rather than a young whip.
Complete girdling below the graft: the cultivar is lost. If the rootstock pushes new growth you can let it grow and graft your chosen variety onto it later, which is a genuinely satisfying way to salvage the situation — but you are starting over.
Either way, protect the replacement properly in its first autumn. The most expensive lesson in cold-climate orcharding is the one people learn twice.
Deer, briefly
Deer are a different scale of problem and need a different answer. They browse to head height and above, and in autumn bucks shred bark rubbing their antlers, which can girdle a young tree in a single evening.
Where deer pressure is real, fencing or deer netting on Amazon.ca around vulnerable plantings is what works. A tall wire cage around individual trees is effective for a small planting; perimeter fencing makes more sense once you have a row of them. Repellents exist and can help at low pressure, but they wash off, need reapplying, and animals habituate — treat them as a supplement, never as the plan.
Common questions
Will my tree survive being girdled?
If any continuous strip of bark remains around the circumference, often yes — weakened, but recoverable. If the ring is complete, the top will almost certainly die, though it may leaf out and look healthy for months first. Check whether the damage is above or below the graft union: below it, even a surviving rootstock means the variety is gone.
Does chicken wire work against voles?
No. Its mesh is large enough for mice and voles to pass through. Use ¼-inch hardware cloth. Chicken wire will deter rabbits, but rabbits are the easier half of the problem.
How high do rabbits reach?
Roughly 45–60 cm above whatever they are standing on — which in winter is the snow surface, not the ground. In a metre of snow they are feeding a metre higher than you planned for. Size the barrier against your deepest expected snowpack.
Do repellents and mothballs work?
Not reliably enough to protect something you cannot replace. Repellents degrade in weather, need repeated application, and animals habituate — and they cannot be reapplied under a snowpack, which is precisely where vole damage happens. Mothballs are not an appropriate outdoor pesticide. Use barriers.
What about rodenticides or poison bait?
We do not recommend them for a home orchard, and the reason is not squeamishness. Rodenticides move up the food chain: a poisoned vole is easy prey, and the owls, hawks, foxes and weasels that eat it are the same predators doing your vole control for free. They are also a genuine hazard to pets and to anything else that finds the bait. Commercial operations under severe pressure sometimes use them as a last resort under specific regulation; for a backyard planting, ¼-inch hardware cloth costs less, works better, and does not kill the animals you want to keep.
Do I need to protect established trees too?
Less urgently. Mature trees have thick, corky bark that is far harder to chew and far more forgiving of partial damage. The critical window is generally the first five years, though what really matters is bark thickness rather than age — species differ. That said, deer rubbing can still damage a mid-sized tree, so it depends which animal you have.
Should I paint the trunk white?
That addresses a different winter problem — sunscald, where the trunk’s south-west side warms on a bright winter day and then refreezes. Interior white latex paint diluted about 1:1 with water, or a white tree wrap, helps with that — but it does nothing about rodents. Both problems affect the same stretch of trunk, so it is worth solving them together.
Protect the trees before you plant more
The most expensive mistake in a cold-climate food forest is not choosing the wrong variety — it is losing three years of growth on a tree you chose correctly. Hardware cloth and an afternoon in October is cheap insurance against that.
Our full guide to cold climate food forests covers what to plant in zones 2 to 6 and what will only disappoint you — and our free Zone Calendar, matched to your postal code, tells you when your season actually opens and closes. Both are worth having before you order another tree.