Poisonous plants in Oregon are ones that you should keep yourself, your kids, and your pets safe from these toxic plants found in the state of Oregon.

Differents Poisonous Plants in Oregon

Whether you’re visiting the state for some vacation time or you live there full time, it is wise to learn about all the harmful plants in there that could potentially hurt you.

Ingestion of even the smallest amounts could lead to something more fatal. Keep learning to find out more about the Oregon plants that are toxic. 

List of Plants That Are Dangerous in Oregon

1. Poison Oak 

Poison oak is a low-growing deciduous shrub, not an oak. Urushiol, a natural oil found in its stems and leaves, can induce a severe skin rash at any time of year, even in the winter when the shrub is dormant.

Toxic Poison Oak Bushes

Toxicodendron pubescens, also known as Atlantic toxic oak, is a native of the Southeast. It is the Pacific toxic oak’s eastern counterpart. The Atlantic toxic oak shares all of the poisonous characteristics of the Pacific toxic oak.

– Characteristics

The plant, native to North America, is valuable to wildlife because robins and other birds prefer the berries, songbirds eat the berries during their fall migration, and other birds eat the insects that reside on toxic oak. However, if toxic oak suddenly appears in your yard, you should put your own safety before the needs of any wildlife. It should be carefully removed after proper identification.

– How to Remove

Toxic oak can be removed in two different ways you can opt to remove it by hand or using herbicides. Herbicide sprays must be timed in accordance with the plant’s stage of growth, On the other hand, you can also try hand removal, but this can be done at any time of the year, and it has to be done with strict cautiousness.

2. Poison Ivy

Known as one of the most poisonous plants ever, poison ivy, it is also known as the Toxicodendron radicans in botany, and this plant is a common poisonous vegetation that grows in yards, along sides of roads, in forests, and even in urban areas. 

Dangerous Poison Ivy Vines

– Features

Toxicodendron radicans is the name of the plant in its scientific name. You may try the simplest approach to identifying toxic ivy, as it features three leaves that would signify it, but you need further details to be certain. You may recognize the plant from these images in both leafy and leafless states, as well as at different stages of maturity.

Even when the plant is completely naked of foliage, contact with any part of it can be hazardous to you, even though the leaves are the part that is the most poisonous. The animal can transmit the disease to you even if your cat or dog comes into touch with the plant. 

The active irritant known as urushiol, an oily chemical that is found in all plant components, is the basis for its toxicity. Pets are occasionally impacted by toxic ivy but are less likely to experience symptoms, which means that they would show different ways that they have ingested it and gotten intoxicated.

– How To Remove

To avoid making contact with toxic ivy while gardening, you should get rid of it from your land. Whether organically, or manually, even with the use of some herbicides, poison ivy can be safely removed, but you must exercise extreme caution, which may require multiple tries.

Because of this, it’s crucial to understand how to identify toxic ivy throughout the growing season and beyond. The plants in this close-up of a leaf are under a foot tall but have already begun to take on their summer green hue.

3. Stringing Nettle 

Urtica dioica, a fast-growing herbaceous perennial that is typically thought of as a weed but is occasionally grown in gardens, is a stinging nettle. Soft-green pointy leaves with serrated edges line erect stems that are three to seven feet tall. 

Stinging Stringing Nettle Plants

– Characteristics 

The stinging nettle has oval-shaped leaves with pointed, jagged teeth on the edges at the ends. This plant has opposite-facing leaves that are arranged along the stem. The blooms are also grouped in lengthy clusters. 

The prickly, stinging spines on the stems and leaves of this plant are its most distinctive characteristic. A scorching, stinging chemical is released when the plant is contacted or eaten by some of the problematic tiny hairs that coat the leaves and stems. 

– Benefits

When cooked, the leaves of stinging nettle have a taste similar to spinach and are quite rich in vitamins A, C as well as other essential nutrients, so even though most gardeners treat it as a noxious weed, it is occasionally planted on purpose because it provides food for the larva of several butterflies. But, even with such properties, it is considered a poisonous variety in Oregon. 

4. Poison Hemlock 

The biennial toxic hemlock plant, Conium maculatum, is indigenous to Europe and North Africa. Despite being extremely deadly to both humans and animals. The toxic hemlock, which is categorized as an invasive plant, has naturalized over time in almost all states.

Deadly Poison Hemlock Flowers

– Characteristics

Along with encroaching on pastures, meadows, and pasture edges, poison hemlock can also invade your yard. Toxic hemlock has a number of relatives in the Apiaceae family, which includes carrots. Find out how to recognize this poisonous and noxious weed, so you can safely remove it.

The leaves, flowers, seeds, stems, and roots of toxic hemlock are all highly dangerous. Even lightly touching or accidentally brushing across it results in serious, permanent harm. 

– Similar Looking Ones

Angelica, American elderberry, Common ragweed, water hemlock, Common yarrow, or Queen Anne’s Lace, deadly nightshade, poison sumac, jimsonweed, wild parsnip, and stinging nettle are some common poisonous plants. All these are ones that have similar features, and they would show the same exact lookalike leaves, but be cautious as all of them are poisonous as some would show it by skin irritation, or eye irritation whereas other would give stomach aches. 

5. Yellow Flag Iris

In wetland areas all over North America, except the Rocky Mountain states, the yellow flag iris, or “flag,” thrives untamed. Although it is not native, it easily becomes one.

Vibrant Yellow Flag Iris Blooms

Unfortunately, once they realize that yellow flag iris is invasive, many American gardeners give up on the idea of planting it in the landscape.

– Characteristics

In addition to having lovely flowers, it also has dramatic, sword-shaped leaves that are almost two inches broad and a lovely shade of greenish-gray. Large seed pods that follow the blossoms make excellent additions to dry flower arrangements as well. While it may have beautiful blossoms, it can be toxic to humans and sometimes animals. 

– Growth Requirements

Many gardeners grow this plant in containers to minimize unintentional rhizome spread. Sink the container completely into the water if you’re using a yellow flag iris in a water garden, which means a stone mulch will help keep the soil in the container. Water as deep as six inches can be used to cultivate yellow flag iris.

6. Foxgloves

There are various biennial, perennial, and shrub species of the Digitalis genus that all go by the common name “foxglove,” but Digitalis purpurea is the one that is most widely grown as a garden plant. The unusually eye-catching common foxglove is a tall, slender specimen with tubular blooms that frequently have bright speckles.

Beautiful Foxgloves Flowers

It is a quickly expanding plant and usually blooms in its second season before passing away.

– Characteristics

The plant only develops a basal clump of foliage in its first year, but in its second year, it sends forth stalks that are two to five feet tall and covered in stunning funnel-shaped pink, white, or purple flowers with white or purple dots bordering the throats. 

– Ways to Intoxicate

Both humans and animals may be poisoned by this plant. One may have symptoms including fatigue, headaches, nausea, abdominal pain, diarrhea, impaired vision, or rashes in the event of the former.


These are six of the deadliest plants currently in Oregon you need to stay away from. Now, you can spot the differences between a regular plant and a poisonous one to make sure nothing harmful happens near you. Just remember: 

  • Ivy, Sumac, and Oak are some of the deadliest toxic plants to exist. All of them look similar to each other too so make sure you stay away from these varieties.
  • Yellow flag iris’ may look beautiful but are too harmful to touch. Make sure to use gloves and other safety gear to keep yourself safe from such hazards.
  • Make sure that you would stay away from them, and be cautious about your pets or children that would wander around these plants, because of the various issues they can cause.

What you must do is grow the awareness and stay away from them, because either one of these plants may harm you in the long run. Which plant have you spotted?


5/5 - (5 votes)
Evergreen Seeds