Top 10 Dangerous Plants Found in Washington State 

Poison Hemlock:is found throughout Washington state. Like the western water hemlock, this plant prefers moist areas to grow. You’ll find them in farmlands, wetlands, urban areas.

Climbing Nightshade:also goes by the name bittersweet along with many others. This is one of the most dangerous plants in Washington state when considering its poisonous nature.

Wild Carrot: may not seem like a threat when one hears their name. However, this species is not the same as the one that humans consume. 

Common Cow Parsnip:doesn’t sound like it is very dangerous. However, the plant is similar to giant hogweed in that its sap contains phototoxic chemicals.

Stinging Nettle  : won’t poison a person. However, they are dangerous plants found in Washington that you should not touch. Stinging nettles are found throughout Washington in various locations.

Poison Ivy:is not as much of a threat as poison oak. Also, this plant does not overlap its range with poison oak that much. Instead, poison ivy is more common in the eastern half of the state.

Giant Hogweed: is a noxious, dangerous plant that can have significant impacts on humans. For the most part, this plant is only found throughout the western part of Washington state. 

Western Water Hemlock:is a large, poisonous plant that is closely related to carrots. These plants are found throughout the western coast of North America. Specifically, the plant is found in meadows

Wild Parsnip:has a phototoxic sap that can make people’s skin blister and break out in a rash when exposed to sunlight. The sap is present in all parts of the plant, making it dangerous to handle.

Poison Oak: is another plant that no person should touch without protection. This plant is found throughout the western half of Washington state only.

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