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Outdoor Plants Safe for Cats and Dogs (And What to Remove)

A planting list that is non-toxic to pets, plus the common garden plants worth removing — lilies, sago palm, foxglove and yew among them.

By Zakaria 3 min read Save to Pinterest — opens Pinterest in a new tab
An Australian shepherd lying on a lawn beside a bed of yellow tulips
Photo: liggraphy, Pixabay Content License, via Pixabay
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“Safe” here means listed as non-toxic, not edible. A pet that eats a large amount of almost any plant may still be sick — the list below avoids the plants that cause real harm.

Non-toxic plants by role

roleoptions
Annual colourSnapdragon, zinnia, petunia, impatiens, calendula, nasturtium
PerennialsCoreopsis, echinacea, aster, phlox, hardy geranium
ShrubsCamellia, viburnum, forsythia, ninebark, escallonia
ClimbersClimbing rose, honeysuckle (ornamental berries still best avoided)
GrassesFescue, feather reed grass, blue oat grass
HerbsBasil, thyme, rosemary, sage, parsley, oregano
FernsBoston fern, sword fern (true ferns, not asparagus fern)
EdiblesBeans, carrots, lettuce, squash, strawberries

The plants to take out

plantrisk
True lily, daylilyAcute kidney failure in cats — tiny amounts, including pollen
Sago palmLiver failure in dogs; seeds worst
OleanderCardiac toxicity, severe
YewCardiac toxicity, often fatal
FoxgloveCardiac glycosides
Autumn crocusSevere gastrointestinal and organ damage
Azalea, rhododendronCardiac and neurological effects
Castor beanRicin — extremely toxic
CyclamenTubers most toxic
Lily of the valleyCardiac glycosides

Lilies and sago palm are not a supervision problem

Both cause organ failure from very small quantities, and lily pollen groomed off a cat’s coat is enough. If you keep pets, remove them rather than planning to watch.

Substitutions that keep the look

instead ofuse
LiliesSnapdragon, zinnia, camellia
Foxglove spikesPenstemon, snapdragon, salvia
Yew hedgeHornbeam, holly, escallonia
Sago palmHardy fern, ornamental grass, cordyline alternative
AzaleaCamellia, viburnum

Non-plant risks worth more attention

  • Cocoa shell mulch — theobromine, dangerous to dogs
  • Metaldehyde slug pellets — lethal, and still in many sheds
  • Antifreeze and rodenticide — the two commonest serious poisonings
  • Compost heaps with mouldy food — tremors and seizures
  • Blue-green algae in ponds and water features — kills dogs quickly
  • Grass clippings in piles, which ferment and are eaten

If something is eaten

  1. Identify the plant; take a photo or a sample
  2. Clear any remaining material from the mouth
  3. Call a vet or pet poison line immediately — do not wait for symptoms
  4. Do not induce vomiting unless told to

Common questions

Which outdoor plants are safe for cats and dogs?

Among flowers and perennials: snapdragon, calendula, nasturtium, sunflower, zinnia, petunia, impatiens, camellia, rose, marigold and most culinary herbs including basil, thyme, rosemary, sage and parsley. Among shrubs and grasses: forsythia, ninebark, viburnum, and ornamental grasses such as fescue and feather reed grass. Those are listed as non-toxic rather than edible — a pet that eats a lot of any plant may still vomit, and grass clippings and mulch cause their own problems.

What are the most dangerous garden plants for pets?

Sago palm, lilies, oleander, yew, foxglove, autumn crocus, azalea and rhododendron, castor bean and cyclamen head most veterinary lists. Lilies deserve particular emphasis for cats: true lilies and daylilies cause acute kidney failure from a very small amount, including pollen groomed off fur. Sago palm is the other standout — the seeds are the most toxic part and cause liver failure in dogs. If you have either and a pet, removal is the right response, not supervision.

Are hydrangeas toxic to cats and dogs?

Mildly. Hydrangea leaves, buds and flowers contain cyanogenic glycosides, and eating a significant quantity causes vomiting, diarrhoea and lethargy. Serious poisoning is uncommon because a pet would need to eat a lot, and most are put off by the taste. It is not a plant to panic about if you already have one, but it is also easy to substitute with camellia or viburnum in a garden with a dog that chews.

What should I do if my pet eats a plant?

Identify the plant, remove any remaining material from the mouth, and call a vet or a pet poison line rather than waiting for symptoms — many of the serious plants cause delayed damage to the kidneys or liver, so a pet that seems fine may not be. Take a photo or a piece of the plant with you. Do not induce vomiting unless a professional tells you to, since some plant material causes more damage coming back up.

Are there pet-safe alternatives to common toxic plants?

Yes, for most of them. Replace lilies with snapdragon, zinnia or camellia for colour; replace sago palm with a hardy fern or ornamental grass; replace foxglove with penstemon or snapdragon for the same vertical spike; replace yew hedging with hornbeam, holly or escallonia. Most garden looks have a non-toxic route to them.

Besides plants, what else in the garden is a risk?

Several things that cause more cases than plants do. Cocoa shell mulch contains theobromine and is dangerous to dogs; slug pellets containing metaldehyde are lethal and still in sheds despite withdrawal in many places; antifreeze, rodenticide and some lawn products are all serious; and compost heaps can contain mouldy food that causes tremors and seizures. Blue-green algae in a pond or water feature kills dogs quickly and is worth knowing by sight.

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