Where Does Poison Hemlock Grow

Identifying the difference between poison hemlock and non-poison hemlock is a very important issue. There are many plants that may look similar but that can cause harmful effects. You need to learn what signs to look for so you can recognize the difference between these plants. In addition, you need to know how to avoid them.


During late spring, you may notice tiny white flowers of poison hemlock growing in rounded clusters on umbrella-shaped stems. These flowers can look similar to Queen Anne’s Lace, but are highly toxic to humans and animals.

In addition to poisoning humans, poison hemlock also can harm livestock. In fact, it is so toxic that it is considered a major health risk. Symptoms of hemlock poisoning include muscle twitching, a rapid and weak pulse, respiratory paralysis, and gastrointestinal irritation.

While poison hemlock can grow in both moist and dry areas, it is more competitive in the latter. Therefore, you should avoid allowing it to grow in your landscape. If you want to keep it out, you can use herbicides. However, you should use the herbicide in a targeted way to ensure that it does not affect other plants. You will likely need to repeat the herbicide several times.

Poison hemlock is an invasive plant that can be found in all fifty states of the United States. It is an opportunistic weed that thrives in disturbed sites. In addition to affecting humans and animals, it can damage natural aquatic systems.

If you are worried that your land might be infested with poison hemlock, you should get rid of it as soon as possible. You can remove it by cutting back the stalks of the plants or by digging up the root mass. When you dig, you should wear protective eyewear and a dust mask.

You should also avoid touching the leaves of the plant. It is toxic to human and animal lungs. If you do remove the plant, wait until after it rains. You can also use a broad spectrum herbicide to kill the plant.


Generally speaking, poison hemlock leaves are toxic to humans and animals. The plant is considered to be one of the most poisonous plants in North America.

Poison hemlock grows up to 10 feet tall and has smooth, hairless stems. The leaves have a fern-like appearance, with large, alternate, triangular, glossy green leaves. They have a rank, pungent odor when crushed.

It is also a skin irritant and can cause miserable dermatitis. To prevent an infestation, you can apply a broad-spectrum herbicide. The herbicide should be applied to the poison hemlock in the vegetative stage, while the seeds are still dormant. It is best to use a contact herbicide containing glyphosate. It is important to wear gloves and a mask when working with this plant.

Although this plant can be used as an ornamental, it is highly toxic to humans and animals. It has been known to kill cattle, horses, and goats. Symptoms of poisoning include dilation of pupils, slowed pulse, and blue coloration around the mouth. A lethal dose is approximately 0.25 to 0.5% of body weight.

It grows along streams and waterways. It can easily invade pastures and riparian areas. In some cases, it has been found in roadways, railroad tracks, fence rows, and waste areas.

Western water hemlock, also known as beaver poison, is a member of the Apiaceae plant family. Its bulbous root structure makes it easy to identify. It thrives in a variety of environments, including streambanks and irrigation ditches.

When it flowers, poison hemlock produces small, five-petaled white flowers. They grow in umbrella-shaped clusters. The flowers appear between May and August. They have four to six brown bracts.


Often mistaken for edible plants, poison hemlock is an invasive, highly toxic plant that can be deadly to humans. This is because the plant contains toxic alkaloids.

Ingestion is dangerous, as the toxins can be absorbed through the skin. The hemlock plant can grow up to three feet tall. As it grows, the leaves become dissected, fern-like, and deeply cut.

The roots of the plant are white, fleshy, and resemble carrots. They also have purple streaks. They can be removed by hand, but you may need a shovel or a trowel if the rosette is present.

The plant’s flowers, which are two to three inches in diameter, are arranged in clusters on stalks. They have five tiny petals, and grow on a tall flowering stem.

Poison hemlock is a biennial plant. It begins as a basal rosette in the first year, and grows into a tall, flowering stalk in the second. As the plant matures, it produces large amounts of seeds.

The seeds are light brown, and have wavy ridges. They are usually dormant in the winter, but can germinate in the summer when conditions are favorable. They can remain viable in the soil for up to six years. The seeds are also highly toxic.

It is a good idea to wear protective clothing when working on an infestation. You should not handle the plant bare-skin, as the sap can be absorbed through the skin. It can be inhaled, and it can affect the central nervous system and the reproductive system of animals.

The plant is a pest in agricultural and natural areas, and it can be spread by water, birds, and other equipment. It can be a problem in areas where livestock and people live, and it can cause respiratory failure in humans and animals. It can also result in skeletal deformities in calves and other livestock.

Symptoms of poisoning

Symptoms of poisoning from poison hemlock include restlessness, weakness, and tremors. Other possible symptoms include respiratory failure, dilated pupils, and paralysis. In severe cases, death may occur.

When you are exposed to poison hemlock, it is important to seek medical attention right away. You need to wear gloves and masks to protect yourself. This is because it is toxic to the skin and respiratory system.

The Washington Poison Center treated 10 people this year for ingesting poison hemlock. The first symptoms are usually nervousness and difficulty walking. They appear within 15 minutes after ingestion. In these cases, doctors will try to decontaminate the digestive tract.

When you are exposed to poison hemlock, you should take plenty of breaks and make sure you are wearing gloves. The plant contains toxic alkaloids that affect the nerve impulse transmission. The effects may vary depending on the size and life cycle of the plant.

One of the most dangerous parts of the plant is the root. The roots are often mistaken for wild parsnips or carrots. They are very toxic to humans and animals. They also cause dermatitis.

The poison hemlock plant is also very toxic to livestock. They can die from ingestion or respiratory failure. The most vulnerable animals are cattle, sheep, and goats. However, all classes of wildlife are susceptible. If you are planning to forage for edible wild plants, you should know what poisonous plants are in your area.

Poison hemlock has no known antidote. The treatment is mainly supportive. It may include ventilation, decontamination of the gastrointestinal tract, and antiseizure medication.

Hemlock poisoning can cause fetal deformities in some animals. If you are pregnant, you may give birth to a deformed baby.


Identifying poison hemlock can be tricky. However, once you know what to look for, it is easier to recognize this plant. It is one of the most poisonous plants in the world, and is common in both the United States and Europe. It can be found in wet and disturbed areas.

The seeds of the poison hemlock plant are highly toxic. These are poisonous when eaten, and can cause severe symptoms within 15 minutes of ingestion. They are also dangerous to livestock, and may be spread by water or birds. It is not uncommon for poison hemlock to invade pastures and other grazing areas, so controlling the infestation is a priority.

The poison hemlock seed is round, with a purple base. It contains two ribbed seeds that split as they mature. They have a dormant period in the winter. When they are ripe, they become grayish-green.

The stem of poison hemlock is hollow and smooth, with purple splotches. The roots are fleshy and white. It has a thick taproot. The leaves are triangular with deep divided leaflets. The flowers are small, creamy white, and occur in small clusters. They are usually shaped like an umbrella.

The flower of the poison hemlock plant grows in late spring or early summer. They are hairless and are grouped in clusters. They can be two to three inches in diameter. They appear in umbrella-like clusters on the tips of branches.

The seeds of the poison hemlock are highly toxic, and can be spread by water or birds. They are not a very long-lived plant, but they can remain viable for two or three years. The seeds can be confused with those of water hemlock, which is a native species.