Are Begonias Deer Resistant? Mostly Yes, With Caveats

Begonias are among the more reliably deer-resistant bedding plants, thanks to bitter sap and fleshy leaves. Why hungry deer still browse them sometimes.

By Zakaria September 16, 2026 4 min read Save to Pinterest

Clusters of pink begonia flowers with yellow centres in close-up — Photo: Stephencdickson, CC BY-SA 4.0, via Wikimedia Commons

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Mostly yes. Begonias sit near the top of most extension services’ “rarely damaged” lists, and the reason is chemical: the sap contains oxalic acid, which is bitter and irritating in a deer’s mouth. The fleshy leaves do not help either.

The short answer

Begonias are among the more reliably deer-resistant bedding plants. They contain oxalic acid, which makes the sap bitter and irritating to a deer's mouth, and their thick fleshy leaves and stems are unappealing in texture. Most extension services list them as rarely damaged. No plant is deer-proof, though — hungry deer in late winter, high-density populations, and young deer sampling new plants all produce occasional browsing, and tuberous begonias can lose their large soft flowers even when the foliage is untouched. If begonias are being eaten in summer, check rabbits and slugs before blaming deer.

Oxalic acid makes the sap bitter — that is the mechanism
Listed “rarely damaged”, not deer-proof
Hungry deer eat almost anything in late winter
Flowers can go even when leaves are left, on tuberous types
Summer damage is more often rabbits or slugs

Where begonias sit on the scale

Extension services rate plants on a scale rather than a yes/no, because deer pressure varies enormously by place and season.

Bedding plants by how often deer damage them

Rating	Plants
Rarely damaged	Begonia, ageratum, sweet alyssum, dusty miller, marigold, snapdragon, salvia, lantana, vinca
Seldom damaged	Zinnia, cosmos, verbena, nicotiana
Occasionally damaged	Petunia, geranium, coleus
Frequently damaged	Impatiens, pansy, hosta, daylily, tulip

Begonias are in the best category. Note the neighbour they are most often confused with in a shady bed: impatiens are in the worst one, so a shade border that mixes both will look as though the deer are picking through it selectively — because they are.

Why deer avoid them

Oxalic acid. It is the same compound that makes rhubarb leaves and sorrel sharp, and it is present throughout begonia foliage and stems. To a browsing deer it is immediately unpleasant, and one mouthful is usually enough to teach avoidance.

Texture. Deer prefer tender, high-moisture growth they can strip quickly. Begonia stems are thick, succulent and awkward rather than leafy.

No strong draw. Unlike hostas or daylilies, begonias are not on the short list of plants deer will detour for.

Oxalic acid matters for pets too

The same compound makes begonias — the tubers especially — toxic to dogs, cats and horses if eaten in quantity, causing mouth irritation, drooling and vomiting. Worth knowing before you plant a bed a puppy digs in.

When they do get eaten

Four situations account for nearly all of it:

Late winter and early spring. Preferred browse is gone and the animals are in the leanest part of the year. Almost nothing is safe then.
High deer density. Where the population is well above what the habitat supports, the “rarely damaged” list compresses toward nothing.
Young deer sampling. Fawns test plants they will avoid as adults. A single bitten stem and then nothing is usually this.
Flowers on tuberous begonias. Large soft blooms get taken even where foliage is ignored. If a border has to look pristine, the smaller-flowered wax begonias are safer.

Check it is actually deer

This is worth ten seconds before you buy a repellent.

Reading the damage

What you see	Culprit
Ragged, torn stem ends, damage above ~18 in	Deer — they have no upper incisors and tear
Clean angled cuts, low down, near ground level	Rabbits
Ragged holes in leaves, slime trails, overnight	Slugs and snails
Seedlings sheared off at soil level	Cutworms
Flowers stripped, foliage untouched	Earwigs, birds, or deer on tuberous types
Plants dug up and tipped out of pots	Squirrels

Building the bed around them

Deer-resistant planting works best as a whole bed, not one plant. A single resistant species surrounded by favourites just means the deer walk past it.

Pair begonias with, for sun to part shade: ageratum, sweet alyssum, snapdragon, marigold, salvia, dusty miller, lantana, vinca.

For shade: ferns, astilbe, lamium, brunnera, hellebore, heuchera.

Keep out of the same bed: hosta, daylily, tulip, impatiens, arborvitae. These are the plants that bring deer into the area in the first place.

And the honest limit

Planting choice changes what gets eaten. It does not change whether deer come. If the goal is fewer deer rather than fewer losses, the only reliable answer is a physical barrier — proper deer fencing at 8 feet or more, or a fenced enclosure around the beds that matter — combined with removing other attractants.

Repellent sprays help at the margins, but they need reapplying after rain and as new growth appears, and deer habituate to any single one. Rotating two different types works better than trusting one.

Common questions

Are begonias deer resistant?

Yes, reliably so by the standards of bedding plants. Begonias contain oxalic acid, which makes the sap bitter and irritating to a deer's mouth, and their thick fleshy leaves and stems are unappealing texture as well. Most extension services list them among the plants deer rarely damage. That is not the same as deer-proof — no plant is — but in a mixed border deer will strip the hostas and daylilies long before they touch the begonias.

Do deer ever eat begonias?

Occasionally, under pressure. Deer browse outside their preferences when the population is high, when snow or drought has removed better options, or in late winter when almost nothing else is available. Young deer also sample plants they will later avoid, which is why you sometimes see a single nipped begonia and no further damage. Damage on a well-fed population in summer is unusual enough to be worth double-checking against rabbits and slugs.

Which begonias are most deer resistant?

All the common groups hold up similarly, because the oxalic acid is in the plant rather than the variety. Wax begonias, tuberous begonias, dragon wing and rex begonias are all listed as rarely damaged. Tuberous begonias with large soft flowers can lose blooms to a browsing deer even when the foliage is left alone, so if a border has to look untouched, the smaller-flowered wax types are the safer pick.

What else is eating my begonias if not deer?

Look at the cut and the height. Deer have no upper incisors and tear rather than slice, so browsed stems look ragged and torn, and damage is usually above about 18 inches. Clean angled cuts low down are rabbits. Ragged holes in leaves with slime trails are slugs and snails. Whole seedlings sheared off at soil level overnight are cutworms. Flowers stripped but foliage intact is often earwigs or birds.

What should I plant with begonias for a deer-resistant bed?

Pair them with other plants deer rarely touch that suit the same conditions: ageratum, sweet alyssum, snapdragon, marigold, salvia, dusty miller, lantana and vinca for sun to part shade, and ferns, astilbe, lamium, brunnera and hellebore for shade. Strongly scented and fuzzy-leaved plants are the general rule. Avoid mixing in hostas, daylilies, tulips or impatiens, all of which draw deer straight into the bed.

Do deer-resistant plants stop deer coming into the yard?

No. Planting choice changes what gets eaten, not whether deer visit. If you want fewer deer, the levers are a real physical barrier — deer fencing of 8 feet or more, or a fenced enclosure around the beds that matter — plus removing other attractants. Repellent sprays work modestly and need reapplying after rain and as new growth appears, and deer habituate to any one of them.

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