If you've got a dog and a garden (or even just a windowsill), it's important to be aware of which flowers could cause problems. Most dogs will have a chew on just about anything, and a quick sniff can turn into a nibble before you can stop them.
The tricky thing is, some of the most popular flowers in the UK are the ones that can make dogs unwell. Daffodils, tulips, and foxgloves. They're in gardens, parks, and hedgerows up and down the country. And while serious plant poisoning isn't an everyday occurrence, PDSA treated around 539 plant-related poisoning cases in 2023 alone, so it's not something to brush off either.
Below, we've put together a seasonal guide to the flowers and plants you'll want to keep your dog away from, along with what to do if they do eat something they shouldn't, and plenty of dog-safe alternatives to brighten up your garden instead.
How common is plant poisoning in dogs?
Most dogs will go their entire lives without eating anything truly dangerous from the garden. But it does happen, and some breeds seem more prone to it than others. Animal Friends insurance data shows that Labradors, Cocker Spaniels, and Cockapoos are among the breeds most commonly treated for toxic plant ingestion, with an average claim cost of around £430.
Puppies and younger dogs tend to be the biggest risk, simply because they explore the world mouth-first. Most cases are mild and resolve with a trip to the vet, but some plants can cause serious harm, especially if the bulb or root is eaten. Knowing which ones to watch for, season by season, makes it much easier to stay one step ahead.
Spring flowers to watch out for
Spring is the peak season for plant-related incidents, partly because so many popular bulbs start coming up just as dogs are spending more time outdoors.
Daffodils
Arguably, the most well-known risk. Every part of the daffodil is toxic to dogs, but the bulbs contain the highest concentration of lycorine, the alkaloid responsible for most symptoms. Dogs who dig up and chew bulbs may experience vomiting, drooling, diarrhoea, and in more serious cases, tremors or changes in heart rate. Symptoms can appear within one to three hours.
If your garden is full of daffodils, don't panic. Most dogs won't bother with them. But if you've got a digger or a puppy, it's worth keeping bulb beds fenced off during planting season and spring.
Tulips
Like daffodils, tulips are most dangerous at the bulb. They contain compounds called tulipalin A and B, which can irritate the mouth and stomach. The Kennel Club notes that incidents with spring bulbs often happen in autumn when bulbs are being planted, or in spring when they start to flower.
Symptoms tend to include drooling, sickness, and diarrhoea. Serious cases are rare but can include breathing difficulties and heart problems.
Bluebells
A springtime woodland classic, and one that most dog walkers will come across on a regular stroll. Bluebells contain toxins that can affect the heart, though a dog would need to eat a significant amount for it to become dangerous. A mild stomach upset is more likely if they have a nibble.
Hyacinths
Popular in garden borders and indoor pots, hyacinths contain calcium oxalate crystals that cause irritation and pain in the mouth and throat. Vomiting, drooling, and diarrhoea are the most common signs. As with most bulb flowers, the bulb itself is the most concentrated source of toxins.
Lily of the valley
It might look harmless, but lily of the valley is one of the more dangerous flowers on this list. It contains around 30 different cardiac glycosides, including convallatoxin, which can seriously interfere with heart function. Even small amounts can cause vomiting, a drop in heart rate, and, in severe cases, seizures. If you suspect your dog has eaten any part of it, contact your vet straight away.
Summer flowers that can cause problems
Summer brings its own set of hazards, particularly in gardens and on country walks where wildflowers and ornamental plants are in full bloom.
Foxgloves
One of the more dangerous plants on this list. Foxgloves contain cardiac glycosides that interfere with the heart's electrical activity, and there is no antidote. Symptoms can range from drooling and vomiting to an irregular heartbeat and collapse. Every part of the plant is toxic, from the flowers right down to the roots.
Foxgloves are at least bitter enough that most dogs will walk away after a quick taste. But if your dog is the type to eat first and ask questions later, it's safest to remove foxgloves from your garden altogether.
Rhododendrons and azaleas
Extremely common in UK gardens and parks, and all parts of both plants are toxic. They contain grayanotoxins that can disrupt normal nerve and muscle function, including the heart. Symptoms usually appear within six hours and can include drooling, vomiting, weakness, and in serious cases, changes to heart rate and blood pressure.
Even a relatively small amount can cause problems. As little as 0.2% of a dog's body weight could be enough to trigger symptoms, so this is one to be especially careful about on walks through ornamental gardens.
Hydrangeas
Hydrangeas are in half the gardens in Britain, and most people have no idea they can cause problems. They contain cyanogenic glycosides, which can cause vomiting, diarrhoea, and lethargy if eaten. Serious poisoning is uncommon, but it's still worth keeping an eye on any dogs that show interest.
Peonies and lupins
Both contain compounds that can irritate the digestive system. Peonies contain paeonol, which may cause vomiting and diarrhoea, while lupins contain alkaloids that can affect the nervous system in larger quantities. Neither tends to cause serious harm, but both are worth keeping off the menu.
Chrysanthemums
Common in late summer borders and bouquets, chrysanthemums contain pyrethrins and sesquiterpene lactones. If eaten, they can cause drooling, vomiting, diarrhoea, and skin irritation. Most cases are mild, but it's another one to be aware of.
Autumn and Winter Hazards
The risk doesn't disappear when the flowers fade. Autumn and winter bring their own set of plants to watch for, many of which catch people off guard.
Autumn crocus
Not to be confused with the spring crocus (which is only mildly irritating), the autumn crocus is one of the most dangerous plants a dog can eat. It contains colchicine, a highly potent alkaloid found in all parts of the plant but concentrated in the seeds and bulbs. Symptoms can include bloody vomiting, diarrhoea, shock, and multi-organ damage. There is no specific antidote, and the effects can be delayed by several days, so you might not connect the dots straight away.
If you spot autumn crocus in your garden or on walks, give it a wide berth.
Ivy
English ivy is everywhere in the UK, climbing walls, covering fences, and creeping through hedgerows. It's mildly toxic to dogs, and eating the leaves or berries can cause vomiting, diarrhoea, and drooling. Prolonged skin contact may also irritate. It's unlikely to cause serious harm, but it's worth discouraging any dogs that like to chew on it.
Holly berries
Holly is considered low toxicity by the Kennel Club, but the bright red berries can still cause stomach upset if eaten. The spiky leaves also pose a physical risk to the mouth and throat. Most dogs won't eat enough to cause serious problems, but it's something to keep in mind if you use holly in Christmas decorations at dog height.
Mistletoe
Another festive fixture that's mildly toxic. Most dogs that eat mistletoe won't show any signs at all, but some may develop drooling, stomach pain, or diarrhoea. It's generally considered low risk, but still best kept out of reach.
Poinsettias
Here's one where the reputation is worse than the reality. Poinsettias are often labelled as highly dangerous to pets, but researchers were unable to find a toxic dose even at the equivalent of 500 to 600 leaves. They contain a milky sap that can cause mild drooling or vomiting, but serious poisoning is extremely unlikely. Worth keeping out of reach, but no need to ban them from the house.
Conkers and acorns
Not flowers, but very common autumn hazards that are worth a mention. Conkers contain aesculin and acorns contain tannic acid, both of which can cause vomiting and diarrhoea. Conkers also pose a choking and blockage risk, especially for smaller dogs. If your dog likes to pick things up on walks, autumn is a good time to keep a close eye on what they're carrying.
Houseplants that can catch you out
It's not just the garden you need to think about. A few popular houseplants can surprise dog owners.
Sago palm
This is the one to take most seriously indoors. Sago palms are extremely toxic to dogs, and even with treatment, only around 50% of dogs who ingest them survive. The seeds are the most dangerous part, but every bit of the plant contains cycasin, which causes severe liver damage. If you have a dog, it's safest to keep sago palms out of the house entirely.
Aloe vera
A bathroom shelf staple, but the saponins in aloe vera can cause vomiting, diarrhoea, and lethargy in dogs. It's rarely serious, but best placed somewhere your dog can't get to.
Philodendrons and cyclamen
Philodendrons contain calcium oxalate crystals that irritate the mouth and throat. Cyclamen roots are the most toxic part, and if eaten in quantity, can cause serious vomiting and even heart rhythm problems. Both are safer up high or in rooms your dog can't get to.
What to do if your dog eats a poisonous plant
Stay calm. Most plant poisoning cases in dogs are mild and treatable, especially when caught early. Here's what to do:
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Try to identify the plant. If you can, take a photo or bring a sample with you to the vet. Knowing exactly what your dog ate helps the vet decide on the best course of action.
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Don't try to make your dog sick. Unless your vet specifically tells you to, inducing vomiting can sometimes do more harm than good.
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Call your vet immediately. Even if your dog seems fine, some toxins take hours to show effects. The earlier you get advice, the better.
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Note what they ate and how much of it. Did they chew a leaf, dig up a bulb, or eat a handful of berries? This helps your vet assess the risk.
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Signs that need urgent attention include repeated vomiting, bloody diarrhoea, difficulty breathing, wobbliness, collapse, or seizures. If you notice any of these, don't wait. Get to a vet as quickly as you can.
Dog-safe flowers you can plant instead
The good bit. You don't have to give up on having a colourful garden just because you've got a dog. There are plenty of flowers that look brilliant and won't cause any harm.
Roses are completely safe for dogs (just watch out for thorns if your dog likes to nose around bushes). Sunflowers are another great pick, and their seeds are safe too. Snapdragons add colour to borders without any risk, and petunias are a reliable, dog-friendly option for pots and hanging baskets.
Gerbera daisies bring a pop of colour indoors or out, and camellias make a safe, showy alternative to rhododendrons if you're looking for a flowering shrub. Lavender is safe for dogs in the garden (they'd need to eat a large amount for it to cause any issues), and it smells lovely to boot.
If you want to check whether a specific plant is safe before buying, the Dogs Trust and VPIS poisonous substances list is a useful UK resource, and the PDSA's guide to poisonous plants covers the most common ones clearly.
