Poisonous Flowers in Your Garden

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Many common and beloved garden flowers are poisonous.  I grow most of them and have had no issues but information is power.

It seems that most folks are unaware of the dangers that exist in the common flower garden. Learn which popular flowers are poisonous to humans and pets.

I did a post on growing Foxgloves and while it seems to be well known as being toxic if eaten many people are unaware that many of their other favorite garden flowers are equally as toxic.

A couple of years back the news media did a sensationalized report on people complaining that big box stores did not have warning labels on the Foxglove plants and since then foxgloves have been massively demonized.

Did you know that many favorite cottage garden flowers are toxic? Come see which ones I grow and why I am not worried. FlowerPatchFarmhouse.com

Why write about Poisonous Flowers?

My case in point….. I can do all sorts of posts on growing Delphiniums, Morning Glories, Sweet Peas, or Black-Eyed Susans, and not one person will jump in and comment on how poisonous they are.

Then I write a post on Foxgloves and all sorts of well-intentioned folks will be quick to comment on the toxicity.

That alone tells me that people are just not educating themselves on what they are bringing home and planting in their gardens or even keeping indoors as houseplants that could be potentially dangerous.

That being said, I will want to include that I have raised 4 kids and numerous pets with not one case of poisoning by plant.  

I grew every single one of these plants in my garden along with a few more that are toxic during that time. 

No one seemed to want to run out to the flower garden and make themselves a salad from them because most of these plants taste horrible. (it is also why many are deer resistant)

To give it perspective kids are 300 times more likely to be poisoned by common household items like laundry detergent, cosmetics, and cleaning supplies than plants in or outside of the home.

300 times!    That is no small statistic.

So I want this to be a balanced approach and the message here is:

“Caution and education are always good in making informed choices but let’s not blow things out of proportion.”

I am going to list 10 of the poisonous flowers that I actually grow now but the list of common plants that are poisonous is extensive. 

When you research it I would recommend using verifiable sources and not just any website or a sensational post on how someone has an allergic reaction to a plant. 

This list includes flowers that all or part is toxic to humans and animals if EATEN.

Most of them you would have to eat quite a bit to be lethal but even a little can make you sick. (be especially careful with puppies who will chew on things most adult dogs would turn their nose up at)

10 poisonous flowers I grow

1. Foxgloves...I guess that is a given and I don’t really need to list it but I will anyway.

foxgloves in garden, flower patch farmhouse, how to save seeds from foxgloves

Foxgloves contain toxic cardiac glycosides. Eating any part of the plant can result in poisoning. Symptoms include nausea, headache, skin irritation, and diarrhea. This toxicity can be severe if enough is eaten.

Foxgloves have also widely been used in folk medicine, and in conventional medicine, their cardiac glycosides have been used to make a heart stimulant drug. 

Related: How to Grow Foxgloves

  2. Black Eyed Susans or Rudbeckia

How to Grow Black Eyed Susans, easy flowers for your cottage garden. Easily reseeds for years of enjoyment and ease. FlowerPatchFarmhouse.com

Black-eyed Susan may be dangerous to cats, dogs, and other household pets if eaten. This flower should also be kept away from small children, who may chew it or get the sap on their skin.

While black-eyed Susan does contain minor toxicity, it is not a common cause of poisoning pets or humans. The main problem is the sap can be a skin irritant.

Related: How to Grow Black Eyed Susans

3. Delphiniums

light blue delphinium, poisonous flowers

Delphinium seeds and plants are very poisonous to both humans and animals and, if ingested, can lead to severe illness, paralyzed, and even death.

Interesting fact: Despite their unsavory qualities, delphiniums used to be used for improving asthma.

Related: How to Grow Delphiniums

4. Morning Glory

Morning glory on trellis, poisonous flowers

Fortunately, eating morning glory flowers is not dangerous. BUT the seeds can be poisonous for both humans and pets, especially in large quantities. They contain a chemical similar to LSD. Symptoms can range widely, from diarrhea to hallucinations.

Related: How to Grow Morning Glories

5. Sweet Pea

July Garden walk, FlowerPatchFarmhouse.com (40 of 40)

The seeds of these Sweet Peas are what is poisonous. They contain amino acids called lathyrogens that, when eaten in large amounts, cause a condition called Lathyrus. But this typically takes weeks or months of continuous ingestion.

Related: Sweet Peas

6. Lilies

Trumpet Lily, FlowerPatchFarmhouse.com

With the Lily all parts, the flowers, fruit, and leaves, are considered poisonous. The sap contained inside the leaves and stems can be a skin irritant.

This sap may cause burning on your skin, or blistering on your mouth and esophagus if you chew and swallow the leaves.

7. Rhododendrons

Rhododendron

Serious poisoning is unlikely when small pieces of azalea or rhododendron are swallowed.

But consuming larger amounts of any part of the plant or even honey made from the flowers of these plants can cause life-threatening symptoms.

The toxin can cause extremely low blood pressure and heart rate as well as irregular heart rhythm.

8. Daffodil

Creamsicle Daffodil, FlowerPatchFarmhouse.com

All parts of the daffodil are toxic. When consumed, it can cause nausea, vomiting, diarrhea, and stomach pain.

Eating the bulb can cause severe irritation of the mouth and stomach upset. These symptoms are usually not life-threatening and resolve within a few hours.

The bulb is what is most poisonous that is why gophers and voles avoid eating them. 

9. Larkspur

larkspur6.jpg

Larkspur is in the Delphinium family and has the same poisonous qualities.

10. Wisteria

wisteria


Wisteria seed pods and seeds are considered the most toxic parts of the plant, but all parts contain the harmful chemicals lectin and wisterin, which can cause a burning sensation in the mouth, abdominal pain, vomiting, and diarrhea if eaten.  

Though no deaths have been reported it is good to keep in mind that if you do have wisteria you might want to cut it back before it goes to seed.

Other class 1 toxic plants common in everyday gardens:

  • Hydrangea
  • Lobelia
  • Lupine
  • Tomato (the leaves and stems)
  • Angels Trumpet (Datura)
  • Azalea
  • Daphne
  • Yew (both Japanese and English)
  • Pampas Grass
  • Potato Plants (green parts)

And though this may seem foolish to say I must add a disclaimer “DO NOT EAT ANY PART OF THE ABOVE LISTED PLANTS”!

This all may sound rather scary but in reality, with most of these plants, we would have to consume a measurable quantity to be in serious danger. And most taste terrible so why would we?

Always educate yourself about what you bring into your home and garden if you have children or pets that may be tempted to nibble on it.

Since so many things have a possibility of causing an issue then good supervision while they may be in the garden is recommended.

Happy Safe Gardening!

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Blue delphinium with text overlay, 10 poisonous flowers, you may be surprised, flower patch farmhouse


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14 Comments

  1. Thank you for this. One thing to emphasize is all kinds of lilies can be life threatening to cats, even the pollen.

  2. Darlene Mings says:

    There are some houseplants that are poisonous also. I learned this when my ex was volunteering with the fire department.

  3. Pamela, this is a wonderful article. I learned a lot and I have been gardening for years. Thanks for all the beautiful work you put into all your web pages. It really is like talking with a good friend. cathy

  4. Very enlightening!

  5. Most herbs are from poison plants…and so over the years many folks have
    argued the idea of ingesting the toxins. If only the subject was evaluated in
    a logical approach, one would realize how many of the current meds issued by
    the medical society are chemically copied from the original source. Interesting how that is not argued. In the many cases of those that ingest on a daily basis the
    meds issued out, we find the damages to the already compromised areas to be even more dangerous within the inner human system. So we have a surmounting problem of addiction and or death. Use sound judgement, diligent research and study.

  6. Good to know! Thanks!

  7. Bummer about having to take the wisteria down. I guess you have too much of it to just dead head to prevent the seeds from forming. That would work if it was doable.

  8. Charlene G. Bryant says:

    We have beautiful Wisteria vines growing on a Gazebo that has finally bloomed after watching and waiting for over three years. I was really excited to see there’s these great big seed pods hanging from it now????? Hence, poisonous seed pods!!!!! Oh NOOOOO!!!! We just starting letting our two shetland sheepdogs out into that part of the yard as well. Looks like I need to spend some time taking those down as one of my dogs (Gibson) spends his entire time roaming the new area finding things to munch on. He ate wild mushrooms the other day and spent part of the evening giving it back to us…yuck. Yes, he’s okay. The mushrooms are all picked up and gone now too.

  9. Better safe than sorry and it is the seeds that are so toxic with Morning Glories but once they go to seed they are everywhere! I had no issues with any eating any of them, kids or our dogs at all, the deer here will eat the leaves and flowers but like I said, it is the seeds that are toxic.

  10. We fenced off a portion of our yard for our dogs. They loved it, we loved just being able to open the door and letting them run free, knowing they were safe. Then we got a little dog who could climb like a monkey, yup, the infamous Jug (Jack Russell/Pug), all 12″ of her required us to go higher and higher with fencing. Can you believe we had to go 7′ high???? And still she’d climb up to the top and fling herself over if she saw us out in the yard. The fence was so unattractive I decided to plant morning glories to try to hide it. They were beautiful and had just started to do what I wanted them to do, climb and flower and hide that awful wire fence when it dawned on me – could they be poisonous? duhhhhh, yeah, I know, why didn’t I think of that in the first place??? I literally ran into the house and googled morning glories and then started screaming for my whole family to go out and start ripping them out of the ground, off the fence, making sure every single little vine was gone. I’m not a stupid person, nor am I married to one, but boy did we feel like a couple of dunderheads admiring our lovely morning glory covered fence not even thinking they could be lethal to our dogs. Thanks for your post Pamela, hope it helps others thinking of planting near their dogs, cats, kiddies.

  11. You are so correct and Oleanders grow here too, I just don’t have them in my garden. I first learned of the toxicity of flowers back in the 80’s when a friend of mine became licensed to open a Day Care in her home. Oleanders were listed as something she would have to remove from her yard (if she had grown them which she did not have any). My children were in their toddler years then and I was intrigued so I educated myself on what was potentially toxic etc. I grew many of these listed anyways as I found the odds of my children eating them were less than them trying to drink our shampoo or dish washing liquid. I always educated my kids as well. They would have to eat more than just a taste to come to harm and the taste is so nasty I did not fret it. But as I said in my post, educating oneself to make choices is important. 🙂

  12. If you were to look up all potentially toxic flowers and plants you wouldn’t plant anything. All of these favorites have been used in garden for centuries and the reality is the likelihood of poisoning from them is low, most people even kids or animals don’t eat them. The leaf texture of many is so offensive as well as the taste is horrible you would have to forcibly ingest it for some stupid reason. Kids won’t even eat veggies that taste good half the time. 🙂 Animals are smart too and typically avoid them. Puppies will gnaw on just about anything and bear watching.

  13. Then, for southern gardeners, there is oleander….don’t use the wood for cooking your hot dog over the campfire, for sure…..at least that’s what i heard years ago…after I planted it in my yard. With a little tot who ate everything he could pick up, that oleander had to go……

  14. I have many of these in my garden, I knew that foxglove and wisteria were an issue, but not daffodils, black eyed susan, morning glory or lilies. Hmmmmmmmmmm….I have a virtual chem shop in the garden! I don’t have small children, and the garden is fenced, when we had a dog we watched her closely. I guess if we get a pup we’ll have to watch her too. Thanks for the info!

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