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37 poisonous plants to keep away from your home

This helpful guide can keep you and your family safe.

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Flowering plants and leafy vines are a great way to add a pop of colour and natural beauty to your indoor and outdoor space, but there's one thing to consider when deciding what to plant: some plants and flowers are poisonous. There are plant varieties that contain toxins which are harmful, and potentially even fatal, to both humans and animals.

While there are blooms that have vibrant hues, unique petals, and delightful scents, don't let that fool you, these plants may still be poisonous. Similarly, there are festive plants that have become holiday staples that, although they are only mildly toxic, should be handled with extra care.

This comprehensive list of poisonous plants and flowers includes over 30 varieties that range in their level of toxicity and can cause everything from severe skin irritation to digestive and respiratory issues. Whether you're looking for low-maintenance houseplants or want to create an enchanting garden, use this visual guide to know what you're purchasing and planting.

1

White Snakeroot

white snakeroot plant
Nahhan / Getty Images

White Snakeroot is a perennial plant that gets up to five-feet tall and has small white flowers that grow in clusters. It contains a toxin by the name of tremetone, which is highly poisonous and can be fatal for both humans and animals. It was famously responsible for the death of Abraham Lincoln's mother, who drank milk from a cow that had eaten a White Snakeroot.

2

Hyacinth

beautiful multi colored hyacinths
EBlokhina / Getty Images

There's so much to love about hyacinths, from their bright colors to their delightful scent. While beautiful, the flowers contain calcium oxalate crystals and narcissus-like alkaloids, making them poisonous to both humans and animals like cats and dogs. They can cause everything from skin irritation to severe digestive issues.

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3

Poison Ivy

poison ivy vine climbing tree trunk
Denise Panyik-Dale / Getty Images

As its name suggests, Poison Ivy is a poisonous plant. It contains a sap called urushiol that irritates the skin upon contact, causing blisters and an itchy rash. Poison ivy is easily recognisable, thanks to its three-leaf clusters, that you definitely want to stay away from. One thing to note is that the plant doesn't stop being poisonous in the winter or when it's dead, as the sap can remain active even years after the plant has been cut down.

4

Poinsettia

red poinsettia plant in a red flower pot
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Poinsettias may be a Christmas dec staple, but they are also poisonous. While their toxicity level is mild, extra care and caution is required, especially if you have pets in the home. Poinsettias contain a milky white sap and if pets or children ingest that or the leaves, it can lead to skin and mouth irritation as well as intense digestive issues.

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5

Clematis

purple flowering clematis (clematis)
Justus de Cuveland / Getty Images

Both the flowers and leaves on a Clematis plant are poisonous to humans and animals. They contain a toxic agent called protoanemonin that can lead to mouth ulcers, irritation, and digestive issues when the plant is consumed. Additionally, touching the plant can cause skin irritation, so make sure you're wearing gloves whenever you prune or plant Clematis.

6

Larkspur

colorful larkspur flowers growing in a field
Andrea Astes / Getty Images

Larkspur, also known as Delphinium, contains diterpene alkaloids which make every part of the plant poisonous, especially the seeds and any new growth. While it's poisonous to humans as well as animals, cattle are among the most vulnerable to its toxic agents. If they graze on Larkspur, it can lead to respiratory paralysis and death.

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7

Morning Glory

blue morning glory plant
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You can instantly recognize a Morning Glory's trumpet-shaped blooms. While the popular vining plant has flowers that aren't toxic, the seeds are. In fact, the seeds contain chemical compounds that make them similar to LSD. They are toxic for humans and pets, and eating them can cause hallucinations, dizziness, numbness, and digestive issues.

8

Monkshood

monks hood (aconitum napellus) flowers in bloom
Tom Meaker / Getty Images

Aconitum is a toxic perennial plant also referred to as Monkshood, because the vibrant flower petals' droopy shape looks like a monk's hood. It blooms in mid-summer and is known to be one of the most poisonous plants because of the high content of toxic alkaloids, which are mainly located in the roots and tubers. Even a tiny ingested amount can cause death due to heart failure.

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9

Amaryllis

amaryllis flowers with christmas tree lights in the background
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Typically purchased during the Christmas period, Amaryllis is a festive plant that happens to be poisonous. Keep the plant away from children and pets, as it contains licoryne and other toxic alkaloids that can lead to vomiting, diarrhea, and abdominal pain. While the whole plant is poisonous, the bulb has the highest concentration of toxins.

10

Virginia Creeper

virginia creeper on a yellow fence
Boris Zhitkov / Getty Images

Although not quite as poisonous as Poison Ivy, Virginia Creeper can still be harmful. It can cause skin irritation, blisters, and a rash when touched, and lead to digestive issues and abdominal pain when ingested. In addition to the leaves being poisonous, the berries are also toxic as they (and the sap) contain oxalate crystals.

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11

Cotoneaster

piece of scandinavian cotoneaster twig with vibrant red berry fruits in the warm sunny fall garden
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While birds typically gravitate towards Cotoneaster's vibrant berries, this plant can be extremely poisonous to humans and animals (cats and dogs included!). It's native to Europe and certain parts of Asia.

12

Iris

a close up shot of iris siberica with an out of focus background.
Pauline Lewis//Getty Images

These common garden plants are known to be harmful to humans and pets. Keep in mind that coming in contact with its roots and leaves can irritate the skin, so it's best to wear long sleeves and gloves if you're going to be handling them.

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13

Lupine

germany, largeleaved lupine, lupinus polyphyllus
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This perennial, a member of the pea family commonly found across the UK, may be prized for its tall, colourful flower spikes, but lupins contain toxic alkaloids that can be harmful to both humans and animals. If ingested, parts of the plant can cause nausea, stomach upset, breathing difficulties, and in severe cases, seizures.

14

Night Blooming Jasmine

night blooming jasmine
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This invasive species can be extremely harmful to pets and animals if it's ingested. Symptoms can range from vomiting to seizures if one is exposed to its toxins.

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15

Wild Parsnip

wild parsnip (pastinaca sativa) growing at the seashore
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At some point, you might have spotted this toxic plant on the side of the road or in an open field. It should be left alone, as its sap can cause severe rashes, blisters, and skin discoloration.

16

Angel's Trumpet

brugmansia, angels trumpet flowers
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This warm-weather plant is a go-to for adding beauty to gardens, but beware since it's part of the nightshade family. The entire plant, from the seeds to the flowers, is toxic and harmful to humans and animals.

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17

Autumn Crocus

dolomites, italy 2024/09/04: close up of alpine meadow saffron
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This spring perennial, which is also known as meadow saffron and naked lady, may be easy to care for, but every part of the plant is highly toxic to humans and pets. Poisoning symptoms range from diarrhea to burning in the mouth.

18

Jimson Weed

jimson weed
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With green leaves, that are sometimes tinged with purple, jimson weed is incredibly unsafe when ingested or inhaled. Although used to treat asthma and other health conditions, it can lead to nausea, vomiting, and hallucinations.

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19

Lantana (Lantana camara)

poisonous plants lantana lantana camara
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Keep these colorful plants away from your children. Although toddlers and babies may find them attractive, they're toxic and poisonous (even to dogs and cats).

20

Bitter Nightshade

poisonous plants bitter nightshade
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Commonly found in creeks, gardens, and parks, these vines or shrubs have been found to cause livestock and pet poisoning.

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