Updated on September 7, 2026
Sometimes. Not candy, not armor. Rutgers rates fall mums (Chrysanthemum) as Occasionally Severely Damaged (C) — the same middle band as dahlias, not the “empty the bed overnight” band that hostas and pansies live in. A grocery-store pot on the porch often survives. The same cultivar at the woods edge often does not. Nursery tags that say “deer-proof mums” are selling hope. So is the internet line that deer never touch them because of pyrethrin.
| Verdict | Sometimes. Rutgers C: Occasionally Severely Damaged. Protect them in deer country. |
|---|---|
| What they eat | Flower heads and tender shoots first; foliage if the plant is easy. |
| Peak | September–frost, when short days force bloom and suburban herds are moving. |
| What works | Pots by the door; wire over the pot; 8-foot fence on in-ground beds. |
| What does not | “Deer-resistant mum” tags, pyrethrin folklore, Irish Spring, a 4-foot picket. |
This is a garden-plant page, not a wild-diet page. For browse in woods and fields, start with what deer eat. For the rest of the planting list, use the deer-proof garden guide — that hub already files mums as “will eat,” which is the honest bucket.
What deer eat on a mum
They take the show. A deer has no upper incisors, so it grabs a bloom or a shoot and tears. After a night raid you get ragged heads, snapped stems, and a plant mowed from about a foot off the ground up to chest height. Woody lower stems and the crown usually stay — which is why a hardy clump can push again next year, and a one-season porch pot looks ruined the morning after.
Fall is the problem, not May. Garden mums are photoperiodic: they set buds as days shorten. That puts an irrigated color buffet in the yard in the same weeks acorns drop and deer start moving toward the rut. Dawn and dusk raids track when deer feed. Those are also the weeks more people hit a deer on the roads the herd uses to reach the porch.
Two plants get sold as “mums.” The grocery cushion pot is usually a florist or garden mum forced under short days and treated as an annual. Hardy garden chrysanthemums — including University of Minnesota Mammoth™ types that can reach three to four feet across in year two — are bred to overwinter. Deer do not read the tag. Hardiness is a winter question. Browse is a September question.
Rutgers Cooperative Extension lists Fall Mums — Chrysanthemum — as Occasionally Severely Damaged (C) and says C and D plants should only go in with fencing or repellents. UGA Extension Circular 985 puts “Chrysanthemum (fall mums)” on the occasionally-or-frequently-browsed list. That is not hosta-level. It is also not lavender-level.
The pyrethrin mix-up
People hear that chrysanthemums make insecticide, then assume the orange pot on the steps is toxic to a doe. NPIC is precise: pyrethrins are a mixture of six chemicals found naturally in some chrysanthemum flowers. The commercial source is Dalmatian chrysanthemum (Tanacetum cinerariifolium), not the garden hybrid Chrysanthemum × morifolium you buy for fall color. Crushing a grocery mum and calling it a deer fence is folklore.
Cornell’s Westchester Master Gardener survey puts painted daisy (Chrysanthemum coccineum / Tanacetum coccineum), Shasta daisy, and feverfew on the “rarely or never eaten” list. Those are daisy-family cousins. They are not the cushion fall mum. If a catalog calls a plant a mum and a deer-resistant perennial in the same breath, check the Latin name before you skip the cage.
Rabbit vs deer vs slug
Do not treat every missing bloom as a deer.
- Deer. Ragged, torn flowers and stems from about a foot up. Hoof prints, pellet piles, a pot tipped overnight. Minnesota Extension: deer damage looks rough or shredded, not cleanly clipped.
- Rabbit. A neat 45-degree cut, usually low. Hardware cloth at the soil line stops rabbits; it does not stop deer.
- Slug / insect. Holes, slime, or stippling, plant still standing. Aphids make mums ugly. They do not leave shredded heads.
Where and when it is worst
Worst yards are suburban edges in the Upper Midwest and Mid-Atlantic — Minnesota, Wisconsin, Michigan, Pennsylvania, New Jersey, New York — where a mum is the last color left and the lot backs to a woodlot. Rutgers built its rating with northern New Jersey nurseries and Master Gardeners. Minnesota is the other honest geography: the University of Minnesota mum program is the only public-sector chrysanthemum breeding program in North America. They patented the cushion habit in 1977 on ‘Minngopher’ and later selected Mammoth™ from oversized 1990 seedlings. Those plants still get browsed. Winter-hardy is not deer-hardy.
A pot on a used front step is a different plant than the same pot at the end of the driveway. Human traffic deters. A quiet side yard is a feeding station. Farther south, heat changes how mums overwinter; it does not make the blooms taste worse.
What actually works
Put the plant where the deer will not stand, or put wire on it. Everything else is a delay.
- Keep porch pots on the porch. Against the house, on steps, in the cone of a motion light. That is the cheapest honest fix for a grocery mum. If you must line the walk, cage them.
- Wire the pot or the clump. Chicken wire or a cylinder taller than the bloom, staked so a nose cannot mash it. Leave a gap so flowers do not grow through the mesh and get eaten from outside.
- Fence in-ground beds at 8 feet. Minnesota Extension says woven-wire fences need to be at least 8 feet tall to protect a larger area. A 4-foot decorative fence is a step. Deer clear that without thinking. Check local height rules. For layout and the rest of the stack, use how to keep deer out of garden beds.
- Repellents as a supplement, not a plan. Egg- or capsaicin-based sprays can buy time if you start before the herd finds the pot, reapply after rain, and rotate formulas. See which organic repellents actually hold up. They will not save an unprotected edge bed in a high-density suburb.
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What does not work as a strategy
A “deer resistant chrysanthemum” tag is not a fence. Irish Spring is not a mum plan — UGA’s circular calls soap, human hair, and animal dung unreliable, and Minnesota Extension notes that hair, perfumed soaps, and mothballs have not been shown to work in tests. Dryer sheets, a 4-foot picket, and a ring of marigolds as a magic moat belong in the same bucket. Marigolds themselves are only “sometimes.” Companion-planting lavender around a mum at the woods edge does not hide the mum.
Plant these instead
If the point is fall color deer walk past, stop restocking the same pot.
- Lavender — aromatic foliage deer skip. Full sun, not a shade-porch plant.
- Salvia — another sun perennial with scent deer dislike, and it still has color when mums are peaking.
- Geraniums — fuzzy leaf, sharp scent, rarely browsed. A better porch-pot swap than another grocery mum.
- Peonies — not a fall bloomer, but a long-term perennial deer usually leave alone if you are rebuilding the bed, not just the September display.
Longer menus: deer-resistant perennials, deer-resistant annuals, and flowers deer don’t eat. Daffodils are the spring-bulb version of this advice (lycorine), not a mum substitute in October.
Related plants in the same fall raid
Mums travel with the other September targets. Dahlias sit in the same Rutgers C band — not a first-choice forage, still worth protecting when better food is gone. Pansies are the true fall “deer candy” in the same porch display. Hydrangeas and pumpkins take the same hungry weeks. If those are already in the yard, a mum at the property line is not a special case. It is the same herd on a different night.
Common questions
Are mums deer-resistant?
No, not as a class. Rutgers’ C rating means they are occasionally severely damaged. In a low-pressure yard they may be left alone. In a suburban herd they need protection. “Deer-resistant mum” on a tag is marketing.
Will mums grow back after deer eat them?
A hardy in-ground mum with the crown intact often will, next season. Cut the shredded stems. A florist pot treated as an annual will not save this year’s show. Repeated stripping weakens even a hardy clump. Minnesota-bred types are selected for cold winters under mulch, not for being eaten every September.
Does pyrethrin in mums keep deer away?
Not in the plant you bought for color. Insecticidal pyrethrins come mainly from Dalmatian chrysanthemum. Garden and florist mums are not that crop.
Will a 4-foot fence save mums?
Not as a yard fence. Eight feet is the number extension services use for a real enclosure. A low cage around a single pot is a different tool — that works because the deer cannot get its head in, not because it cannot jump.
Sources
- Rutgers Cooperative Extension — Landscape Plants Rated by Deer Resistance (Fall Mums, Chrysanthemum, Occasionally Severely Damaged — C)
- UGA Extension Circular 985 — Deer-Tolerant Ornamental Plants (chrysanthemum / fall mums on the browse list)
- Cornell Cooperative Extension of Westchester County — Resistance of Annuals, Biennials, Perennials, Groundcovers, and Vines to Deer Damage (painted daisy, Shasta daisy, feverfew rarely eaten; not garden mums)
- University of Minnesota — Chrysanthemum breeding (Minnesota Hardy)
- University of Minnesota Extension — White-tailed deer damage
- National Pesticide Information Center — Pyrethrins fact sheet
Part of the Deer-Proof Garden Guide. Wild diet lives on what deer eat.
