Poison hemlock sighted across Finland raising concerns about public safety

The highly toxic plant known as poison hemlock has been sighted across Finland this summer. Thriving in moist areas such as shorelines, it has been reported in locations including Janakkala, Lahti, Jyväskylä, and Oulu.

Mika Pajari, a university lecturer at the University of Eastern Finland’s Department of Environmental and Biological Sciences, explains what distinguishes this plant. Poison hemlock resembles the well-known cow parsley but can often be mistaken for other similar umbellifers due to its large white flower clusters. The most effective way to identify poison hemlock is by examining its leaves. While cow parsley has leaflets that slightly resemble those of ferns, poison hemlock has long, narrow leaves with serrated edges.

Though poison hemlock is native to Finland and has existed for thousands of years, there is no cause for panic—it’s important, however, to recognize it. This plant typically grows in damp environments, such as riverbanks and wetlands, where it can flourish. In high water conditions, it can even grow submerged.

The entire plant is toxic to the touch, and ingestion can be extremely dangerous. The symptoms of poisoning, including nausea, can appear rapidly, and if someone consumes poison hemlock, it is crucial to contact emergency services or a poison control center immediately. The plant has a flavor similar to parsley, which might mislead foragers of edible wild plants.

If poison hemlock is spotted, especially on a beach, the safest option is to avoid touching it. However, if removal is necessary, it should be done with protective gear to prevent skin contact. Any cut plant parts should be disposed of carefully, as they can contaminate water temporarily. Despite its presence, swimming near poison hemlock is safe if precautions are taken not to touch the plants.