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NASHVILLE, Tenn. (WKRN) — A highly toxic plant, that can be deadly if ingested, is spreading fast around the U.S.

Conium maculatum, commonly known as poison hemlock, is on the verge of blooming in Tennessee, as reported by the Tennessee Department of Agriculture. This plant can already be observed proliferating along roadsides, fields, and fence lines. Poison hemlock is widespread across the country and is visible in various seasons, but it usually experiences its fastest growth between March and May.

According to Joe Boggs, an assistant professor at Ohio State University, poison hemlock was considered “relatively rare” about three decades ago; however, its presence is now increasingly common, he told Nexstar’s WCMH.

Experts say the plant is toxic to humans and animals, adding that just touching or inhaling particles while cutting can be harmful.

Here’s everything you need to know and look for as poison hemlock begins to flower.

What is poison hemlock?

The U.S. Department of Agriculture said poison hemlock can be found throughout the United States and has white flowers that grow in small clusters.

The plant tends to start flowering in early spring and is often found along fence lines, irrigation ditches, and other damp environments. When fully grown, poison hemlock can reach a towering 9 feet in height.

Officials described the plant as having a “hollow stem usually marked with small purple spots” with leaves that are delicate, like parsley, and has a white taproot. Its roots are sometimes confused for wild parsnips.

If ingested, what are the symptoms?

Experts warn that all parts of poison hemlock—including the leaves, stem, fruit, and root—are poisonous, especially in the spring when the plant flowers.

According to the USDA, ingestion of the plant is “frequently fatal” for livestock. In fact, sheep can reportedly be poisoned by eating as little as three ounces of green leaves. Animals can die from respiratory paralysis in 2 to 3 hours after eating the plant.

Humans shouldn’t eat any part of the plant either. “Often, poisoning occurs after the victim confuses hemlock root with wild parsnips, hemlock leaves with parsley, or hemlock seed with anise,” the USDA explains. “Whistles made from hollow stems of poison-hemlock have caused death in children.”

The USDA said signs of poisoning include:

  • Nervous trembling
  • Lack of coordination
  • Dilation of pupils
  • Respiratory paralysis
  • Rapid, weak pulse
  • Coma
  • Convulsions
  • Bloody feces and gastrointestinal irritation
  • Skeletal defects in calves

The Cleveland Clinic reports that humans won’t get a rash from touching the plant, but added people with sensitive skin can develop dermatitis. In severe cases, hemlock poisonings can reportedly cause complications such as: slow heartbeat, low blood pressure, muscle paralysis and kidney failure.

How to safely remove the plant from your property

The Tennessee Department of Agriculture said residents should never mow or burn poison hemlock on their property. Instead, people should use gloves to remove the plant and consult with their local agricultural officials for safe removal options.

Officials said hand pulling may be effective for small populations of the plant and recommend bagging it before disposing to prevent seed dispersal.

Herbicides can be used for larger areas but is most effective before the plant flowers, according to the Department of Natural Resources and Parks in King County, Washington.

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