Deer-Resistant Plant FAQ

What do the four resistance ratings mean?

This site uses the Rutgers NJAES scale, which extension services across the country work from:

• Rarely Damaged. Deer choose it last. Your safest planting.
• Seldom Severely Damaged. Light browsing, rarely ruined.
• Occasionally Severely Damaged. Fine under low pressure, destroyed under high.
• Frequently Severely Damaged. Expect total loss without protection.

The scale's own instruction for the bottom two tiers is that those plants should only be grown with additional protection such as fencing or repellents. That makes the rating a rule about where a plant can go, not just whether to buy it. See what to avoid.

None of the tiers says deer-proof, and the list's introduction states plainly that no plant is.

How was this plant list actually made?

By people who watch deer eat gardens for a living, not by a trial. Worth knowing, because it sets how far to trust it.

It was compiled with input from nursery and landscape professionals, extension personnel and Master Gardeners in northern New Jersey. It is practitioner consensus rather than a controlled feeding trial, and it names no deer species anywhere.

One filing decision gives away how regional it is: Rutgers lists rosemary under annuals, because northern New Jersey cannot overwinter it. That is a hardiness judgement from one state baked into a list used nationally.

Our own methodology page sets out what we have verified and what we have not.

Why do deer-resistant plant lists contradict each other?

Because preference is regional and seasonal, and most lists do not say where or when they were compiled.

A list from coastal California describes mule deer with year-round forage. A list from Pennsylvania describes white-tailed deer facing a genuine February shortage. Those animals make different choices about the same plant, and roses are the clearest case: Rutgers puts them in its third tier of four, while Colorado State, writing for mule deer, puts most roses in the worst of its three.

Trust lists that name their source and region.

Does deer pressure in my area change the answer?

Substantially. Backing onto woodland with a resident herd, only the Rarely Damaged tier is reliable. In a suburb with deer passing through, Seldom and often Occasionally rated plants survive.

The practical test is to walk your boundary and look at what has already been eaten. That tells you your real pressure better than any list.

If something rated Rarely Damaged is being browsed on your property, move the whole plan one tier more conservative. That single adjustment is worth more than any individual plant recommendation.

Are native plants more deer-resistant?

Often the opposite, and this is the most common misconception in the subject.

Native deer evolved alongside native plants and are well adapted to eating them. Several of the most reliably resistant garden plants are Mediterranean: lavender, catmint, russian sage, thyme, santolina. Their aromatic oils are a defence North American deer never developed a tolerance for.

Plant natives for the ecological benefits, which are real and substantial. Do not plant them expecting deer resistance. Our state native lists flag resistance separately for exactly this reason.

Why are so many resistant plants silver or purple?

Because of what makes them resistant, rather than because of the colour.

Aromatic defence concentrates in the mint family, which is heavily weighted toward blue and violet flowers. Fuzzy defence means a dense layer of trichomes, and that is what makes a leaf look silver.

So the palette clusters as a side effect. It is a useful design shortcut and a bad test: a purple flower on an undefended plant, tulips being the obvious case, is eaten exactly as fast as a red one. More on this in colour.

What can I plant in shade where deer browse?

This is the hardest combination in gardening, and it is why so many lists dodge it. The honest answer is ferns: every fern on the Rutgers list sits in the top tier, which no other plant group manages. That is the direct replacement for hosta, which is in the worst tier and is the plant most people are actually asking about.

Beyond ferns the shade palette is narrower than the sun one but not empty -- barrenwort, hellebore, Solomon's seal, wild ginger and lungwort all hold up. The full list is at deer-resistant plants for shade.

Do deer eat bulbs?

Tulips, enthusiastically. Deer take the flowers above ground; bulb digging is more often squirrels and voles.

Daffodils, alliums, fritillaria and snowdrops carry compounds deer avoid. Daffodils are the strongest single substitution in deer gardening, because they are left alone by deer and rodents, so they solve two problems at once.

If you want spring bulbs where deer live, plant daffodils and skip tulips.

Do deer eat grass?

Barely. Deer are concentrate selectors: their rumen is built for buds, shoots and broadleaf growth, not bulk fibre, and grass makes up under a tenth of the diet in most of the range. That is exactly why ornamental grasses sit high on the resistant list -- grass is the wrong shape of food entirely, rather than being defended by scent or toxin.

Two exceptions. Annual cereal grains are grazed hard, which is why rye and oats are planted for deer on purpose. And tall fescue is among the least preferred of all, because the fungal endophyte in it makes deer sick -- so deer working fescue hard is a signal that the range is overbrowsed and better food has run out.

Do aromatic plants protect what is next to them?

Somewhat, and there is a mechanism behind it.

Deer use plant volatiles as a pre-ingestive cue. After sniffing high-terpene plants they were reluctant to begin foraging at all, and when they did feed they ate less. The decision happens at the nose, before anything is tasted.

That is an argument against the companion-planting version of this idea: one lavender among six hostas does nothing for the hostas. Whole-border aromatics are a different proposition. It is a real effect and a weak one, and it will not stop a hungry deer that has decided your roses are worth it.

What about plants sold as "deer-resistant" at garden centers?

Treat the label as marketing. Retail tags are tied to no rating system and are frequently wrong; hydrangeas and hostas are both sold as deer-resistant in some markets.

Check against a rated list before buying. That is what this site is for.

Will a resistant plant ever get eaten?

Yes, in late winter, when fat reserves are lowest and everything else has gone. Even Utah State's own lavender guidance notes that in some areas deer may browse it.

Ratings describe what deer choose when they have a choice. February is the month they do not.