Poison Hemlock Plant

Whether you are interested in gardening or simply like plants in your home, there are a few facts you should know about Poison Hemlock Plants. They can be very dangerous to humans and pets alike. Here is a brief look at what you need to know about them, including their life cycle, symptoms, and controls.

Life cycle

Often confused with a water parsnip, poison hemlock is an invasive weed that is toxic to animals and humans. It grows in pastures, ditches, and waterways. Its stems have a strong pungent odor, and its leaves have toxic compounds.

Poison hemlock is a biennial plant that grows as a rosette of leaves in its first year and as a flowering plant in its second year. In the first year, it grows as a rosette of dark green leaves. In the second year, it grows as a flowering plant with a tall, flowering stem. Its flower stalks grow to approximately six to ten feet tall.

Poison hemlock grows in pastures and in fallow fields. Its taproot is a fleshy white root system. Its leaves are divided into small segments, resembling ferns. The leaves also have red or purple blotches. The leaves emit a rank odor when crushed.

Poison hemlock is one of the most poisonous plants in North America. It has a strong, pungent odor, and its leaves contain toxic alkaloids. Symptoms of poison hemlock appear within 20 minutes to 3 hours after exposure. The sap in the leaves is toxic to livestock, and the leaves can cause a rash.

Poison hemlock has an extensive root system, resembling a small white carrot. It grows in pastures, ditches, fallow fields, and in natural aquatic systems. It is easily controlled. Its seeds are highly toxic when eaten. They are also carried by water, birds, and rodents.

Poison hemlock seeds can germinate when temperatures reach 85 F to 60 F. They will then remain in a dormant state for about two to three years. If conditions are favorable, they can germinate in late summer or early spring. The seeds can remain viable for up to six years.

Poison hemlock produces about 35,000 to 40,000 seeds per year. The seeds are round and lined with vertical wavy ribs. They are generally harmless to animals, but the seeds are poisonous to humans.

Poison hemlock can survive in dry areas, but it can quickly outcompete other plants. It can also grow in no-till fields, fencerows, and pastures.


Symptoms of poison hemlock plant can include muscle twitching, respiratory failure, and paralysis. These symptoms can begin within 30 minutes to 2 hours after exposure to the plant. If you suspect you have poison hemlock, seek emergency medical attention right away.

The plant contains toxic compounds called alkaloids. They affect the nervous system, the respiratory system, and the cardiovascular system. They also can be absorbed through the skin. When ingested, alkaloids cause muscle spasms and confusion. They are also highly toxic to humans. If you suspect that you or a loved one has been exposed to poison hemlock, seek emergency medical care right away.

The plant is particularly toxic to livestock. It can be found in marshes, wet areas, and on roadsides. It also grows in pastures and waste areas. It is usually mixed with other harmless plants.

It looks like an umbrella-shaped flower and has numerous leaves. It has a strong, unpleasant musty odor. It can be confused with other carrot family plants, such as wild carrots and Queen Anne’s lace. It is also commonly mistaken for wild parsnips.

Poison hemlock can be fatal to humans. In some cases, it can cause respiratory failure, muscle paralysis, and death. It can also cause dermatitis and rhabdomyolisis. In addition, it can be fatal to pets.

The plant contains a toxic compound called g-coniine. It has nicotine-like effects. The plant also contains piperdine alkaloids, which disrupt the motor neuron-muscle fiber connection.

When exposed to poison hemlock, you may experience a burning sensation in your mouth. You may also experience a tremor, nervous trembling, slow heartbeat, and pupil dilation. If you are allergic to the plant, you may also develop a rash.

The plant’s toxic alkaloids can be absorbed through the skin. If you are allergic to it, you may need to protect your skin by using barrier products, such as lotions or towelettes. It is also recommended to wear gloves when handling the plant.

Treatment for poison hemlock may include intravenous fluids, antiseizure medication, securing the airway, and ventilation. It can also include decontaminating the gastrointestinal tract.


Among the most invasive plants in North America, poison hemlock (Phecyllium sp.) is found growing in disturbed areas such as along roads, fencerows, and streams. It has an elevated profile in the weed community because it produces a large number of toxic compounds that can be toxic to humans and animals. This means that it should be properly controlled to prevent outbreaks.

The best way to control poison hemlock is to prevent the plant from producing seed. When this happens, it becomes easier to control the plant. To do this, try overseeding with a competitive plant.

Herbicides are also an effective control method for poison hemlock. The best time to apply herbicides is late February to early March. For best results, use herbicides containing 2,4-D or dicamba+2,4-D.

Poison hemlock is not a native plant, but it has become an invasive weed in North America and Europe. It is a biennial plant that produces umbrella-shaped clusters of white flowers. These clusters are composed of small flowers, which range in width from 7 to 15 inches.

Poison hemlock is also known as wild carrot. Like the wild carrot, it is a member of the carrot family (Apiaceae). In fact, it looks a lot like a carrot. The leaves are green, glossy, and triangular in shape, and clasp to the stem at the node. The stem is smooth and hollow between the nodes.

Poison hemlock is an invasive non-native weed that is becoming more common in the eastern U.S. and the upper Midwest. It can be found growing along roads, fencerows, and pastures. It is a particularly bad weed for livestock, and can be fatal.

Poison hemlock is a highly toxic plant that can be dangerous to people. It produces a large number of chemicals, including gamma-coniceine, which causes respiratory failure in mammals. These chemicals are present in the greatest concentrations in the plant’s seeds. Those who ingest them are likely to experience nausea, vomiting, trembling, and bloody feces. Symptoms may also include loss of coordination and paralysis.

To control poison hemlock, a combination of a postemergent herbicide and mechanical control is required. A hand-pulling technique is an effective method for mechanical management.

Common looks-alikes

Identifying poison hemlock plants can be tricky. These plants look similar to a variety of edible plants, and can cause serious damage to livestock or humans. It is important to know how to identify these plants before trying to harvest them.

Poison Hemlock has fern-like leaves that are divided into fine, toothed leaflets. The stems are also finely divided, and have reddish streaks. The flowers are white, and have umbrella-shaped clusters. The plant can grow to 6 feet or more, and is very toxic to humans and animals.

Its roots are so toxic that they can kill horses and cows. It also thrives in marshes, rivers, and irrigation ditches. Western waterhemlock is the most toxic of all of the water hemlocks.

Poison hemlock is a plant with a two-year life cycle. It starts as a rosette and produces a tall flowering stalk in its second year. In its first year, it grows to about two feet tall. In the second year, the plant produces white umbel flowers on the stalk.

Poison hemlock look-alikes include Queen Anne’s lace, wild carrot, and parsnips. These plants can all be mistaken for poison hemlock. However, the look-alikes are not as toxic.

Queen Anne’s lace is a pretty wildflower. It has white flowers that turn into elderberries in the fall. The leaves are small, and have pronged bracts at the base of the flowers. The stems are hairy and ribbed.

Wild carrot has densely packed umbrella-shaped flower clusters. Its flowers appear in late summer. It is a native northwest wildflower. The stems are hairy, and its leaves are lacy and green. It grows to about three feet tall.

Japanese hedge parsley has fine hairs on the leaves. It also has hooked hairs on its fruit. It has no purple spotting. It generally does not grow to six feet tall, but it can be mistaken for poison hemlock.

Cow parsnip is similar to poison hemlock, but has a thicker stem and larger leaves. It grows in wet roadside ditches, and its flowers appear later in the summer. It is in the same “wild carrot” family as Poison Hemlock.