How to Tell If Deer Are Eating Your Plants

Deer have no upper incisors. They grip a shoot between their lower teeth and a hard upper palate and pull.

That single piece of anatomy is the most reliable identification you have, because it decides what the wound looks like. Everything else on this page follows from it.

The stub tells you the animal

Look at the end of the shoot rather than at the plant as a whole. A clean angled cut six inches off the ground is a rabbit, and no amount of deer fencing will help.

Bark is the other clean separator. Rodents gnaw and leave visible parallel tooth marks. Deer strip, tearing bark upward in sheets, and leave nothing that looks like teeth.

The browse line

Damage runs from the ground to roughly six feet, and it stops abruptly.

That flat ceiling across a hedge or a woodland edge is diagnostic. Forest ecologists use exactly this: when every palatable thing below five or six feet is gone and the understory is hollow, the deer population has outrun its food. On a hedge, deer typically work the bottom four to five feet, taking the tips of lower branches as far up as they can reach.

Snow moves the line up. Two feet of settled snow is a two-foot ladder, and the part of a hedge that was safe last winter is not safe this one. This is why repellent guidance says to treat six feet above maximum expected snow depth rather than six feet above the ground.

What season the damage happened in

Winter damage is more extensive than summer damage, and it is the reason most people end up here.

Deer eat roughly a ton of forage a year and winter browse is poor food. They lose weight on it even where it is unlimited. So a hedge that was ignored for years gets hit in February not because anything changed about the hedge but because everything else ran out.

Damage peaks in early spring, when fat reserves are at their lowest. That is also when repellents are least reliable and hardest to apply, which is the awkward overlap at the centre of this whole subject.

Needle browsing means something different

If deer are eating spruce, fir or pine needles, read it as a signal about the herd rather than about your planting.

Those needles made up 58 to 60 per cent of the rumen contents of starved deer autopsied in late winter during past population peaks. In healthy deer they are a minor part of the winter diet. Deer eat them when there is nothing else.

Cedar is the exception. Arborvitae foliage is genuinely preferred, outranking deciduous twigs and every other conifer, which is why arborvitae is the most commonly destroyed hedge in the country and sits in the worst tier of the Rutgers ratings.

Will it grow back

This is the question that actually matters once the damage is done, and the answer splits hard by plant type.

Conifers mostly will not. Arborvitae, spruce, fir and juniper carry no dormant buds along older stems. Foliage stripped below the browse line does not return on that wood. The result is described as a stemmed flute glass: a permanently bare lower section under a healthy top that keeps growing out of reach.

Broadleaf evergreens usually will. Boxwood, holly and euonymus carry dormant buds on old stems and can rejuvenate.

Before cutting anything out, wait until mid-June. Buds on arborvitae and juniper are hard to see, and a branch that has produced no new growth by then is dead. Anything you remove earlier is a guess, and it is a guess you cannot reverse.

Damage that is not browsing

Two other kinds, both worth recognising.

Buck rub. Bark shredded vertically on a young trunk, usually between one and four feet, with the wood underneath scored. This is antler rubbing in autumn, not feeding. It girdles young trees and kills them, and it happens on smooth-barked saplings by preference. A trunk guard prevents it; a repellent does not, because the animal is not eating.

Trampling and bedding. Flattened areas in long grass or beds, often repeated in the same spot, with browsing nearby but not on the flattened plants themselves.

What it tells you to do next

• Torn stubs up to six feet: deer. Fencing, or a repellent programme with realistic expectations.
• Clean 45-degree cuts under two feet: rabbits. Different problem, cheaper fence.
• Tooth marks in bark: rodents, usually voles under mulch or snow. Pull mulch back from trunks.
• Vertical shredding on a young trunk: buck rub. Trunk guards before autumn.
• Needles eaten off spruce or pine: the local population is under real pressure, and plant choice alone will not fix your garden.

The full sequence, from reading the damage to deciding what to spend, is in keeping deer out of the garden. Where the damage is on something you cannot replace, be realistic about what a spray achieves. Minnesota Extension sets the benchmark plainly: a 50 per cent reduction in deer browse is very successful, and 30 per cent is the likelier result. That number decides whether spraying is a strategy or a delaying tactic.

The identification signs above come from extension guidance for white-tailed deer and are consistent across the sources. Mule deer and black-tailed deer share the same dentition and leave the same torn stub, so the anatomy travels even where the plant preferences do not.

Will it grow back after browsing?

It depends on the plant, and the split is sharp. Conifers -- arborvitae, spruce, juniper -- carry no dormant buds on old stems, so anything stripped below the browse line never returns on that wood. Yew is the one needled exception: Penn State Extension notes it holds dormant buds on old wood and can be rejuvenated by hard cuts. Broadleaf evergreens such as boxwood and holly recover. Deciduous shrubs almost always do, losing a season of shape rather than the plant. In every case, cut the torn stub back cleanly to a bud -- UNH Extension makes the point that a clean pruner cut heals far better than the ragged wound a deer leaves. There is more on the design consequences in the garden design FAQ.