Common Outdoor Plants that are Poisonous to Dogs

Here’s a list, including a visual guide of popular outdoor plants that are poisonous to our dogs.

Common British garden plants that are poisonous to your dog

Below are a list of plants that are poisonous to your dog - where there is a * beside the name of the plant, that means they can be fatal in even very small quantities. Please note that the list is not exhaustive and it's worth remembering that your dog may have an allergic reaction to something not normally considered harmful to dogs.

Other dangers in the garden

As well as detailing poisonous plants outdoors, all bulbs should be assumed as being highly poisonous. Additionally, common fruit pips and stones contain cyanide and are highly poisonous, so do not give apple core to your dog to finish and make sure you pick up windfalls if you have fruit trees in your garden. Assume all toadstools and fungi are poisonous to your dog.

Note too that the cocoa husks sometimes used for mulch are also poisonous if your dog eats them. Be alert to poisoning and allergic reaction symptoms in your dog. If you think that your pet may have ingested or developed a reaction to something poisonous - contact your vet immediately, day or night.

Signs of poisoning can include vomiting, diarrhoea, listlessness, fits, coma, excessive itching (dermatitis), swelling of the mouth or tongue, swelling of the eyes, rapid heart rate and abnormal or erratic behaviour.

Achillea (Yarrow) Achillea (Yarrow)
Aconite* (Wolf's Bane) Aconite* (Wolf's Bane)
Anemone Anemone
Aquilegia (Columbine or Granny's Bonnet) Aquilegia (Columbine or Granny's Bonnet)
Arisaema (Jack in the pulpit) Arisaema (Jack in the pulpit)
Arum (cuckoo pint)* Arum (cuckoo pint)*
Autumn Crocus* Autumn Crocus*
Azalea* Azalea*
Bittersweet* Bittersweet*
Bleeding Hearts Bleeding Hearts
Bluebell Bluebell
Box Box
Bracken Bracken
Buttercup Buttercup
Broom Broom
Caltha (Kingcup and Marsh Marigold) Caltha (Kingcup and Marsh Marigold)
Chrysanthemum Chrysanthemum
Castor Oil Plant (seeds and beans*) Castor Oil Plant (seeds and beans*)
Clematis Clematis
Crown vetch Crown vetch
Cyclamen* Cyclamen*
Daphne* Daphne*
Datura Stramonium* (Jimson Weed, Thorn  Apple) Datura Stramonium* (Jimson Weed, Thorn Apple)
Deadly nightshade (all nightshades)* Deadly nightshade (all nightshades)*
Delphinium Delphinium
Elder Elder
Elderberry Elderberry
Elephant Ears* Elephant Ears*
Euonymus Euonymus
Euphorbia - the sap is harmful to fish Euphorbia - the sap is harmful to fish
False Hellebore False Hellebore
Ficus (figs) Ficus (figs)
Flax Flax
Foxgloves Foxgloves
Fritillary (Snake's head) Fritillary (Snake's head)
Geranium Geranium
Gypsophila Gypsophila
Hellebore Hellebore
Hemlock (all types)* Hemlock (all types)*
Holly Holly
Horse chestnut Horse chestnut
Hydrangea Hydrangea
Iris Iris
Ivy Ivy
Juniper Juniper
Kalmia varieties (Mountain Laurel) Kalmia varieties (Mountain Laurel)
Laburnum Laburnum
Lantana Lantana
Larkspur* Larkspur*
Laurel Laurel
Leyland Cypress Leyland Cypress
Lily of the Valley Lily of the Valley
Lobelia Lobelia
Lupin Lupin
Mallow Mallow
Maple Maple
Mistletoe* Mistletoe*
Morning Glory Morning Glory
Oak trees (acorns) Oak trees (acorns)
Oleander (Nerium) the sap  is harmful to the eyes Oleander (Nerium) the sap is harmful to the eyes
Onion* Onion*
Peonies (roots) Peonies (roots)
Polygonatum  (Solomon's Seal) Polygonatum (Solomon's Seal)
Poppy (seed pods) Poppy (seed pods)
Potato plant Potato plant
Privet Privet
Prunus family (wild cherry, almond, apricot) Prunus family (wild cherry, almond, apricot)
Ragwort* Ragwort*
Rhododendron Rhododendron
Rhubarb (leaves)* Rhubarb (leaves)*
Rue* Rue*
Snowdrops Snowdrops
Spruce Spruce
Tiger Lily Tiger Lily
Tomato Plant Tomato Plant
Tulip Tulip
Wisteria Wisteria
Yew* Yew*

We do hope you find our poisonous plant guide helpful. If we have not mentioned a plant that is poisonous to our pets, then please let us know! You can contact us at