Poison hemlock, a weed harmful to people and animals that sometimes is mistaken for an edible member of the carrot family, is now blooming all over Washington state, including in Whatcom County.
Last year, there were several cases of human ingestion or exposure to poison hemlock, with one resulting in the death of a woman, according to the Washington Poison Center. It was the first such human fatality in Washington since 1999.
A Bellingham man was hospitalized last spring after he mistook the hemlock as edible and chopped it up into his salad.
It is imperative to be able to identify poison hemlock to prevent accidental ingestion. It can be mistaken for many edible and ornamental members of the carrot family, such as parsley, parsnip, wild carrot and anise, which have similar-looking flowers, leaves and seeds.
Poison hemlock (Conium maculatum) is a biennial plant that can grow very tall, reaching heights of 4 to 9 feet. The hollow stem is smooth and hairless and has distinctive purple blotches all over it.
It has large, glossy green, finely divided fern-like leaves that are smooth and hairless. Like many members of the carrot family, poison hemlock produces flat-topped flower arrangements consisting of small clusters of tiny white flowers.
Chemical compounds in poison hemlock give the entire plant - especially the leaves when crushed - an unpleasant odor that has been described as musky or resembling the smell of mouse urine.
An aggressive invasive species, poison hemlock rapidly colonizes stream banks, vacant lots, roadsides, pastures and meadows, especially where the soil is moist. It often takes over spaces, knocking out native plants and desirable forage species.
Poison hemlock contains toxic alkaloids in all plant parts, but they are most concentrated in unripe seeds. The poisonous compounds affect the nervous system. Initial symptoms may include a burning sensation in the mouth, nausea, vomiting, confusion, respiratory depression and muscle paralysis. Death, when it occurs, is usually rapid and due to respiratory paralysis.
Due to its toxicity and invasiveness, poison hemlock is a listed Class B noxious weed in Washington. It is designated for control in many counties throughout the state, which means landowners in the counties are required by law to control and prevent the spread of the noxious weed.
However, because poison hemlock is so dangerous to have around, the state and county noxious weed control boards recommend controlling it wherever it grows. It is advisable to wear gloves and protective clothing, such as long sleeves, pants and eye protection, when removing poison hemlock to prevent accidental exposure to plant juices. Wash your hands after removing poison hemlock.
Small patches of poison hemlock can be dug up, making sure to remove the taproot. Do not cut or mow the plants, as they will only resprout.
Herbicides containing the chemical glyphosate are readily available and can be very effective. Be sure to follow the label carefully. The best time to spray poison hemlock is when the leaves are just a basal rosette, and before it forms flowers; however, herbicide control work can be done whenever the plant is actively growing, prior to seed development.
Remember that the toxins will remain potent in dried plant material, so bag and trash dead plants. Never put pulled poison hemlock in the compost or leave it where children or livestock might eat it.
Follow-up efforts will be necessary to control seedlings that may germinate at the site. Planting grasses or other desirable plants will provide competition and help prevent new poison hemlock plants from establishing.
Local county noxious weed control boards, WSU extension offices, and conservation districts can provide help identifying and controlling poison hemlock and other noxious or toxic weeds.
Ingestion of poison hemlock should be taken seriously; people who have done so should be taken to the emergency room.
Alison Halpern is executive secretary of the Washington State Noxious Weed Control Board.
MORE INFORMATION
For more information about poison hemlock poisoning and symptoms, contact the Washington Poison Center, 1-800-222-1222.
For more about the plant, go to whatcomcounty.us, (PDF).
