There are many reasons why some people just wouldn’t want any toxic plants in their gardens. Maybe they have livestock nearby or pets that could potentially get poisoned if they have a nibble.
If the idea of toxic plants makes you deeply uncomfortable inside, you might be surprised to learn that some of the most common garden plants are actually quite toxic!
In today’s article, let’s uncover some of these toxic plants and understand why they don’t belong in your garden. But first…
Are These Plants Really Toxic? Here’s How We Chose Them
So, of course, since we aren’t scientists and botanologists, we cannot conduct our own studies and research in this matter. This is where Mr. Google comes in handy.
The list below is compiled using sources that include but are not limited to ASPCA, UC Davis, Woodland Trust, and Good Housekeeping. All these sources list the plants we’re going to discuss among the most toxic garden species out there!
To make things simple, we’re judging the plants on these criteria:
Toxic Plants That Shouldn’t Be In Your Garden
1: Oleander (Nerium Oleander)
Risk: High!
All parts of the oleander shrub are highly toxic, just a single leaf can cause serious heart issues or even death if ingested.
This ornamental shrub has a very distinct look, often blooming crimson, pink, and white flowers. Unfortunately, various parts of this shrub contain cardiac glycosides, which, if ingested, can lead to nausea, heart problems, and skin/eye irritation (upon contact).
Do not plant this shrub in your primary garden, especially if there will be kids or pets in there!
2: Castor Bean Plant (Ricinus Communis)
Risk: Extreme!
Contains ricin, one of the most potent natural toxins, just a few beans can be deadly if ingested.
While castor beans aren’t exactly known to be problematic, their seeds are actually high in ricin levels, and one can suffer serious consequences if they’re ingested in large amounts.
Just avoid castor bean plants entirely, since there’s no real “safe treatment” in case they’re ingested.
And while not toxic like castor bean, some perennials can still cause major garden trouble by being invasive, it’s worth knowing what to avoid for a healthier space.
3: Foxglove (Digitalis Purpurea)
Risk: Severe!
Yes, floxgloves are used medicinally, but they’re still a threat in the garden. Can cause heart failure if consumed.
You might think that with so much aesthetic appeal and elegance, foxgloves can’t do much. Well…wrong! Despite the tubular flower spikes, their leaves do possess high amounts of cardiac glycosides, which, as we discussed, can trigger heart issues rather quickly.
Tip: Let foxgloves go if you have a safety concern. Opt for safer alternatives like Penstemon or foxglove look‑alikes.
4: Jimsonweed / Devil’s Trumpet (Datura Stramonium)
Risk: Severe!
Highly hallucinogenic and toxic; can trigger confusion, delirium, or death if eaten.
Like the name suggests, devil’s trumpets offer white trumpet-shaped blooms that contain certain compounds called tropane alkaloids. Believe it or not, these compounds can actually cause hallucinations, delirium, and even death!
If you have kids or pets strolling around the garden often, DO NOT plant devil’s trumpets in there! When handling this toxic plant, make sure to use gloves and protective eyewear.
5: Monkshood (Aconitum Napellus)
Risk: Extreme!
Absorption through skin or ingestion can cause respiratory failure, handle with extreme caution.
Monkshood plants produce these vibrant, hooded blooms in shades of blue and purple. However, these blooms contain aconitine, which is a strong neurotoxin that affects the heart and lungs aggressively. Even skin contact with aconitine can lead to poisoning!
Tip: Instead of monkshoods, opt for non-toxic perennial varieties like delphinium.
6: Belladonna (Deadly Nightshade, Atropa Belladonna)
Risk: Extreme!
Just a few berries can be fatal. Disrupts the nervous system and can cause paralysis.
While the glossy berries belladonna plants offer might look appealing at first, they’re actually highly poisonous due to the high amounts of alkaloids they contain. These alkaloids can cause dilation of the pupils, bad hallucinations, and potential respiratory failure.
Immediately remove belladonna plants from your garden if any kids or pets are in the area.
7: Rhubarb Leaves (Rheum Spp.)
Risk: Moderate!
While the stalks are edible, the leaves contain oxalic acid, which can cause kidney failure in large amounts.
While rhubarb stems are completely edible and delicious, the leaves do contain compounds like oxalic acid and anthraquinones, which could potentially cause kidney failure.
Tip: If you are growing rhubarb in your home garden, inform everyone not to use the leaves and only utilize the stems for cooking.
And while rhubarb’s risk lies in its leaves, some plants can be a real headache simply because they take over your garden, worth a quick look before planting anything new.
Are These Plants Dangerous To Humans & Animals?
While some of the plants on this list are only dangerous for humans to ingest, they can also be poisonous to pets, especially cats and dogs, since those are the most common pets.
If you have livestock, they are at a higher risk of ingesting toxic plants from your garden, as these plants don’t look much different from regular, safe plants.
It’s very important that you’re able to catch early symptoms if you do have toxic plants in your garden. These symptoms will typically include vomiting, panic, sudden heart issues, seizures, skin irritation, etc.
Let’s Conclude
If you have kids, pets, or livestock in your garden/backyard, avoid toxic plants like the plague! It’s simply not worth risking lives or costly vet and hospital visits for plants that can easily be replaced with safer, equally beautiful alternatives. Plant safe, plant smart!
