Can Dogs Have Thyme? 50 Dangerous Garden Plants for Dogs

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29 Minute Read
 | Amy Dyck
Updated April 9, 2021

The backyard can be fun and full of surprises for our canine friends to enjoy - and plenty of plans toxic to dogs. But don't let one of those surprises be a trip to the veterinarian. Keep your yard and garden safe for dogs by avoiding these plants, flowers, shrubs, and trees that could make them very sick. Or, at the very least, plant them with caution and always supervise your pet. Can dogs eat thyme? Can dogs eat rosemary? And can dogs eat parsley? What plants are toxic to dogs? Read on to find out.

***WARNING: This list is meant for general information purposes only, including the toxicity scale. It is by no means to be replaced for qualified veterinary advice. If your pet could have possibly ingested any of these plants, you should call your vet immediately.

While this list covers many of the common toxic plants for dogs, it does not list wildlife or household plants. For even more information on dangerous plants for pets, our friends at Rover built a dangerous plants database for dogs and cats. 

Full List of Dangerous Garden Plants for Dogs

 


Herbs, Vegetables, and other Edible Plants That Are Dangerous for Dogs

1. Chamomile

plants bad for dogs

Scientific name: Anthemis nobilis

A lovely herb often used in teas and in aromatherapy for soothing and calming nerves, the chamomile plant is toxic to dogs. While chamomile is safe in products for dogs, you want to avoid your dog's contact with the actual plant.

Possible symptoms: Contact dermatitis, vomiting, diarrhea, anorexia, allergic reactions, bleeding tendencies (long-term use). Source.

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2. Chives

plants dangerous to dogs

Scientific name: Allium schoenoprasum

Chives, along with others in the Allium family, such as onions, can be quite harmful to dogs when ingested. While they can tolerate low doses (as you'll find some flavoring in dog treats), it is best to avoid these plentiful herbs whenever possible.

Possible symptoms: Drooling, nausea, oral irritation, vomiting, diarrhea, lethargy, abdominal pain, elevated heart rate and respiratory rate, weakness, exercise intolerance, collapse, pale gums Source.

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3. Garlic

plants harmful to dogs 

Scientific name: Allium sativum

A member of the Allium family, just like chives, garlic is delicious, but can be mildly to moderately dangerous for dogs if fed in large quantities. Small portions of garlic have health benefits, but if your dog goes to town on a garlic plant in your garden, it can be harmful. Keep a close eye and only allow him to eat garlic that it appropriately dosed for his weight. 

Possible symptoms: Drooling, nausea, oral irritation, vomiting, diarrhea, lethargy, abdominal pain, elevated heart rate and respiratory rate, weakness, exercise intolerance, collapse, pale gums Source.

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4. Hops

what plants are toxic to dogs

Scientific name: Humulus Lupulus

With home-brewing on the rise, you may need to watch out for hops growing in backyards. The plants are enormous climbing vines, so they should be easy to spot. The effects can be quite severe, with dried hops being the most toxic form. Keep any home-brewing materials and leftovers safely contained - hops can be hazardous whether fresh, dried, or cooked (spent hops).

Possible symptoms: panting, high body temperature, seizures, death. Source.

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5. Leeks

can dogs have thyme

Scientific name: Allium ampeloprasum

Another, slightly less popular member of the Allium family, leeks makes a delicious addition to soups and many other dishes. However, just don't feed them to your dog. Like other members of the onion family, they can cause some very uncomfortable symptoms for dogs.

Possible symptoms: Drooling, nausea, oral irritation, vomiting, diarrhea, lethargy, abdominal pain, elevated heart rate, and respiratory rate, weakness, exercise intolerance, collapse, pale gums Source.

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6. Marijuana

plants bad for dogs 

Scientific name: Cannabis genus

With marijuana legalization a hot topic, and the prevalence of medical use, you should take precautions that your dog does not come across the live marijuana plant or dried cannabis in any form. Symptoms can be mild to moderate, and even include death.

Possible symptoms: Prolonged depression, vomiting, incoordination, sleepiness or excitation, hypersalivation, dilated pupils, low blood pressure, low body temperature, seizure, coma, death (rare)  Source.

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7. Onions and Shallots

plants dangerous to dogs

Scientific name: Allium cepa (var. aggregatum - shallots)

A popular seasoning vegetable, onions (and the less common shallots) are a staple for many gardens. However, extra caution if you have dogs (or cats, who are even more susceptible to toxic effects). 

Possible symptoms: Drooling, nausea, oral irritation, vomiting, diarrhea, lethargy, abdominal pain, elevated heart rate, and respiratory rate, weakness, exercise intolerance, collapse, pale gums Source.

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8. Rhubarb

plants harmful to dogs

Scientific name: Rheum rhabarbarum

An early spring perennial, rhubarb is delicious when added to pies, crips, and other baked dog treats. However, the leaves (and less so, stalks) contain oxalate crystals, which can wreak havoc with your dog's urinary tract. They're also flowers poisonous to dogs to people, so always be careful when handling them.

Possible symptoms: Drooling, loss of appetite, vomiting, diarrhea, lethargy, weakness, tremors, blood in urine, changes to thirst, and urination Source.

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9. Tomato Plants

what plants are toxic to dogs

Scientific name: Solanum lycopersicum

Tomatoes are a vegetable garden favourite, but grower beware. A member of the nightshade family, tomato vines, and leaves can cause some worrying symptoms in pets (and people, too). 

Possible symptoms: Hypersalivation, inappetence, severe gastrointestinal upset, diarrhea, drowsiness, CNS depression, confusion, behavioral change, weakness, dilated pupils, slow heart rate Source.

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Flowers, Vines, and Ferns That Are Dangerous for Dogs

9 Solution to keep your Pept

10. Amaryllis

 can dogs have thyme

Scientific name: Amaryllis belladonna (or other species), or Hippeastrum

Sometimes also called the Narcissus, these Lily-family bulb plants can be dangerous to both dogs and cats, but is not as plants dangerous to dogs as true lilies. Toxins can be found in the leaves and stems, and are most concentrated in the bulbs. 

Possible symptoms: Drooling, vomiting, hypotension, respiratory depression, abdominal discomfort Source.

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11. Asparagus Fern

plants bad for dogs 

Scientific name: Asparagus densiflorus cv. Sprengeri

Usually found indoors as an ornamental plant, but sometimes outdoor in the summer, the Asparagus Fern can make your pet feel uncomfortable if exposed through touch or if ingested. Also called the Emerald Fern or the Lace Fern. 

Possible symptoms: Allergic dermatitis with repeated exposure, gastric upset from berry ingestion (vomiting, abdominal pain, or diarrhea) Source.

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12. Autumn Crocus

plants dangerous to dogs

Scientific name: Colchicum autumnale

Not to be confused with the more common spring Crocus, the autumn-blooming crocus can cause very severe gastrointestinal upset and even respiratory or kidney failure and death. The spring Crocus can still cause gastrointestinal upset, but the symptoms are usually mild. 

Possible symptoms: Drooling, vomiting, diarrhea, loss of appetite, bloody diarrhea, black tarry stool, organ damage, respiratory failure, seizures, death Source.

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13. Begonia

plants harmful to dogs

Scientific name: Begonia genus

These bright perennials (annuals in cool regions) are numerous in variety and very popular as a garden plant and even an indoor plant. However, they can cause some very uncomfortable symptoms in pets if they are ingested, particularly the highly toxic tubers.

Possible symptoms: Oral irritation, intense burning, and irritation of mouth, tongue, and lips, excessive drooling, vomiting, difficulty swallowing Source.

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14. Laceflower

 what plants are toxic to dogs

Scientific name: Ammi majus

This flower is a garden flower, prized for its versatility in cut flower arrangements. A member of the carrot family can cause pain and other worrying symptoms if ingested or touched. Also called False Queen Anne's Lace, Bishop's Weed, Queen of Africa, or Greater Ammi.

Possible symptoms: Oral irritation, intense burning, and irritation of mouth, tongue, and lips, excessive drooling, vomiting, difficulty swallowing Source.

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15. Bleeding Heart

 can dogs have thyme

Scientific name: Lamprocapnos spectabilis

This popular shade-loving garden flower is a beauty in the spring, but if ingested, it's been linked to digestive upset and tremors.

Possible symptoms: Vomiting, diarrhea, staggering, tremors Source.

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16. Buttercup

plants bad for dogs

Scientific name: Ranunculous genus 

While most of the varieties are seen as weeds, buttercups have pretty flowers and can be found quite commonly in gardens and lawns and growing wild in certain regions. The buttercup is unpleasant should your pet happen to consume it. Fortunately, since it does cause painful mouth blisters, usually pets do not consume enough to do lasting harm.

Possible symptoms: Drooling, vomiting, diarrhea, weakness, oral blisters, tremors, seizures, paralysis (rare) Source

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17. Castor Bean

plants dangerous to dogs

Scientific name: Ricinus communis

The castor bean plant is a big, beautiful ornamental if you live in a warm enough climate to sustain one year-round. However, the deadly toxin ricin can be found within the beans (seeds). 

Possible symptoms: Inappetance, drooling, abdominal pain, vomiting, severe bloody diarrhea, abdominal straining, weakness, trembling, hypotension, sudden collapse, death Source

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18. Chrysanthemum

plants harmful to dogs

Scientific name: Chrysanthemum genus

These lovely annuals, commonly called 'mums',  are popular in gardens and as house plants or cut flowers. When ingested by pets, they usually have a mild effect, but it is worth noting considering their popularity. The toxin they contain, pyrethrins, is used in dog tick and flea medications.

Possible symptoms: Inappetance, vomiting, diarrhea Source

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19. Clematis

what plants are toxic to dogs

Scientific name: Clematis genus

This gorgeous vine produces large, star-shaped blooms. The plant has a bitter taste, so your pet is unlikely to ingest a lot of it. 

Possible symptoms: Salivation, vomiting, diarrhea Source

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20. Cyclamen

can dogs have thyme

Scientific name: Cyclamen genus

Cyclamen is a popular houseplant with unique upswept flowers and beautiful variation in their leaves, but they're also dangerous for dogs and cats. The tubers are the most poisonous, and can result in seizures, heart problems, and even death when consumed in large quantities.

Possible symptoms: Drooling, vomiting, diarrhea, abnormal heart rate, seizures, death Source

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21. Daffodil

plants bad for dogs

Scientific name: Narcissus genus

Popular in the early spring around Easter, the daffodil may cause a severe reaction in your pet, so it's best to see a veterinarian if your pet ingests it, particularly the bulb.

Possible symptoms: Vomiting, salvation, diarrhea; large ingestions: convulsions, low blood pressure, tremors and cardiac arrhythmias Source

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22. Foxglove

plants dangerous to dogs

Scientific name: Digitalis purpurea

The foxglove may be beautiful, but all parts of the plant are very toxic for dogs, cats, and even humans to consume. 

Possible symptoms: Drooling, nausea, vomiting, abnormal heart rate, cardiac arrythmias, weakness, collapse, dilated pupils, tremors, seizures, death Source

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23. Geranium

plants harmful to dogs

Scientific name: Pelargonium genus

The ever-popular geranium comes in many different colours and varieties. There are two species of geraniums, each of which has countless cultivars. The Geranium genus is safe (also called Cranesbill), but the Pelargonium species is toxic for pets.

Possible symptoms: Vomiting, loss of appetite, lethargy, skin rash, decreased heart rate, decrease in blood pressure, depression Source

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24. Gladiola

what plants are toxic to dogs

Scientific name: Gladiolus genus

Gladiolas make quite a presence in gardens with their impressive stalks of large blooms. The perennials also spread quickly through seed. Like most bulb flowers, the highest concentration of toxin is in the bulb or corm.

Possible symptoms: Salivation, vomiting, drooling, lethargy, diarrhea Source

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25. Hosta

 can dogs have thyme

Scientific name: Hosta genus

A common shade-loving plant, the hosta comes in many different cultivars that can vary widely.

Possible symptoms: Vomiting, diarrhea, depression Source

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26. Iris

plants bad for dogs

Scientific name: Iris genus

The common name for all flowers in the iris genus, irises have beautiful, bright coloured blooms that can cause issues for pets if ingested. 

Possible symptoms: Vomiting, diarrhea, drooling Source

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27. Ivy 

plants dangerous to dogs

Scientific name: Hedera helix

English Ivy, also called Needlepoint Ivy, Sweetheart Ivy, Glacier Ivy, or Branching Ivy, will cause your pet to experience uncomfortable symptoms if consumed. The leaves are more poisonous than the berries. 

Possible symptoms: Vomiting, abdominal pain, hypersalivation, diarrhea Source

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28. Larkspur

plants harmful to dogs

Scientific name: Delphinium genus

Larkspur, sometimes called Delphinium, can cause some very worrying symptoms in pets. The plant loses toxicity with age and certain seasons, but should be avoided at any rate. 

Possible symptoms: neuromuscular paralysis, constipation, colic, salivation, muscle tremors, stiffness, weakness, recumbency, convulsions, cardiac failure, death from respiratory paralysis Source

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29. Lily

what plants are toxic to dogs

Scientific name(s): Zantedeschia aethiopica, Spathiphyllum, Cordyline australis

There are so many varieties of lilies, and while most of them are incredibly toxic to cats, only a few are poisonous for dogs. Calla Lilies, Peace Lilies, and Palm Lilies are all plants toxic to dogs. These plants are rarely seen outdoors out of sub-tropical or tropical climates, but are popular indoor houseplants.

Possible symptoms: Oral irritation, intense burning and irritation of mouth, tongue and lips, excessive drooling, vomiting, difficulty swallowing Source

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30. Lily-of-the-Valley

can dogs have thyme

Scientific name(s): Convallaria majalis

A popular shade flower that can spread quickly, Lily-of-the-valley is a beautiful and fragrant flower, but can produce very serious symptoms in pets and people. Watch out especially for the orange-coloured berries, which are the most toxic.

Possible symptoms: Vomiting, diarrhea, slowed heart rate, severe heart arrythmias, seizures, death Source

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31. Monkshood

plants bad for dogs

Scientific name(s): Aconitum genus

Also called Aconite or Wolfsbane, Monkshood has gorgeous, purple sculptural blooms, but it is bushes poisonous to dogs to humans and should be planted with caution.

Possible symptoms: Weakness, heart arrythmias, paralysis, tremors, seizures Source

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32. Morning Glory

plants dangerous to dogs

Scientific name(s): Ipomea genus

A lovely climbing vine, the morning glory is quick-growing with purple trumpet-shaped blooms. If large amounts are ingested, particularly the seeds, the plant can be very toxic.

Possible symptoms: Incoordination, diarrhea, anemia, liver failure Source

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33. Periwinkle

plants harmful to dogs

Scientific name(s): Vinca rosea

With its small namesake blue or pink flowers, periwinkle makes an attractive ground-cover plant, but it can be quite toxic, even resulting in death (rare).

Possible symptoms: Vomiting, diarrhea, low blood pressure, depression, tremors, seizures, coma, death. Source

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34. Primrose

what plants are toxic to dogs

Scientific name(s): Primula vulgaris

The primrose comes in many different colours and contains an unknown toxin that produces mild effects in pets.

Possible symptoms: Mild vomiting. Source

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35. Star of Bethlehem

 can dogs have thyme

Scientific name(s): Ornithogalum genus

A beautiful star-shaped flower, the Star-of-Bethlehem contains a toxin that behaves similarly to a common heart and veterinary medicine, digitalis or digoxin. 

Possible symptoms: Drooling, nausea, vomiting, changes in heart rate, cardiac arrhythmias, weakness, collapse, dilated pupils, tremors, seizures, death Source

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36. Sweet Pea

plants bad for dogs

Scientific name(s): Lathyrus latifolius

A common vine with multi-coloured flowers, the sweet pea can be hazardous to dogs and other animals when ingested, particularly in large amounts.

Possible symptoms: Weakness, lethargy, pacing, head pressing, tremors, seizures, possible death Source

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37. Tulip/Narcissus

can dogs have thyme

Scientific name(s): Tulipa genus

Tulips are everywhere in the springtime and a garden staple. But, you should be cautious with them around your dog, particularly the bulbs, which are the most toxic. 

Possible symptoms: Vomiting, depression, diarrhea, hypersalivation Source

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38. Wisteria

plants dangerous to dogs

Scientific name(s): Wisteria genus

A cascading climbing vine in the pea family, Wisteria contains a few toxic compounds that can affect pets. 

Possible symptoms: Vomiting (sometimes with blood), diarrhea, depression Source

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39. Yarrow

plants harmful to dogs

Scientific name(s): Achillea millefolium

A common and easy-spreading garden perennial, yarrow contains several toxic elements that can make your pet quite uncomfortable if ingested.

Possible symptoms: vomiting, diarrhea, depression, anorexia, hypersalivation Source

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Trees and Shrubs That Are Dangerous For Dogs

40. Apple Tree

 what plants are toxic to dogs

Scientific name(s): Malus genus

Apples are a tasty treat for dogs, but some parts of the apple tree (including crabapple trees) pose some risk to dogs as a toxin. The leaves, stems, and seeds all contain cyanide, and are particularly toxic when they are wilting. 

Possible symptoms: Red mucous membranes, dilated pupils, difficulty breathing, panting, shock. Source

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41. Apricot Tree

can dogs have thyme 

Scientific name(s): Various Prunus species, including Prunus armeniaca, Prunus brigantinaPrunus mandshuricaPrunus mume, and Prunus sibirica

Apricots are safe for dogs to eat, as long as you remove the pit. But similarly to apple trees, the leaves and stems of the apricot tree contain cyanide, in higher concentrations if they are wilting. 

Possible symptoms: Red mucous membranes, dilated pupils, difficulty breathing, panting, shock. Source

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42. Bead Tree

plants bad for dogs

Scientific name(s): Melia azedarac

Also called Chinaberry Tree, Indian Lilac or White Cedar, this unique tree with star-shaped lavender blooms and yellow globe fruit can be very harmful to pets if ingested, especially in large quantities. The highest concentration of the toxin is in the fruit.

Possible symptoms: drooling, vomiting, diarrhea, and depression; with larger ingestions, seizures and deathSource

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43. Burning Bush

plants dangerous to dogs

Scientific name(s): Euonymus alatus, Euronymus atropurpurea

A garden ornamental with bright red leaves in fall and pink and orange berries, the Burning Bush makes a stunning addition to the yard. However, the plant is an invasive species in certain areas, such as Massachusetts and New Hampshire and can also be toxic to dogs cats, and even humans, particularly the berries or seeds.

Possible symptoms: Vomiting, diarrhea, abdominal pain, weakness; with larger ingestions, heart rhythm abnormalities. Source

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44. Cherry Tree

plants harmful to dogs

Scientific name(s): Various Prunus species, such as Prunus avium and Prunus cerasus

Like apple and apricot trees, leaves, stems, and pits of all kinds of cherry trees contain cyanide. Pay particular concern if the leaves are in the wilting stage. 

Possible symptoms: Red mucous membranes, dilated pupils, difficulty breathing, panting, shock. Source

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45. Hydrangea

what plants are toxic to dogs 

Scientific name: Hydrangea genus

Hydrangea is a decorative garden shrub with tight globe-like clusters of blue, purple, or pink flowers. It is also a common cut flower or houseplant. The leaves and flowers are the most toxic parts. 

Possible symptoms: Vomiting, diarrhea, lethargy Source

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46. Oleander

can dogs have thyme

Scientific name: Nerium oleander

Oleander is a lovely garden shrub prized for its evergreen leaves and pale pink, purple, or white flowers, but it is one of the more toxic plants found in the garden

Possible symptoms: colic, diarrhea (possibly bloody), sweating, incoordination, shallow/difficult breathing, muscle tremors, recumbenc; large ingestions can result in death from cardiac failure Source

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47. Peach Tree

plants bad for dogs

Scientific name(s): Prunus persica

Like apple, cherry, and apricot trees, leaves, stems, and pits of peach trees contain cyanide. They are even more toxic if the leaves are in the wilting stage. 

Possible symptoms: Red mucous membranes, dilated pupils, difficulty breathing, panting, shock. Source

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48. Plum Tree

plants dangerous to dogs

Scientific name(s): Various Prunus species, such as Prunus domestica 

Like apple, cherry, peach, and apricot trees, leaves, stems, and pits of all kinds of plum trees contain cyanide. and are most toxic when the leaves are in the wilting stage. 

Possible symptoms: Red mucous membranes, dilated pupils, difficulty breathing, panting, shock. Source

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49. Winterberry Holly

plants harmful to dogs 

Scientific name(s): Holly genus 

You may not have to worry about this evergreen hedge shrub unless you are in a warm enough climate for it to grow, which excludes most of Canada. However, many kinds of holly can be found indoors during the winter months, as people decorate for Christmas.  

Possible symptoms: Lip smacking, drooling, head shaking, vomiting, diarrhea, loss of appetite Source

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50. Yew

what plants are toxic to dogs 

Scientific name(s): Taxus genus

A common evergreen with many variations, the yew tree or shrub is extremely toxic to dogs, humans, and many other animals. The genus name, Taxus, is even where we get the term "toxic" from. Avoid planting it in your garden.

Possible symptoms: Drooling, vomiting, weakness, difficulty breathing, life threatening changes in blood pressure and heart rate, dilated pupils, tremors, seizures, coma, death Source.

 

9 Solution to keep your Pept

 

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Written by

Amy Dyck

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