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Avoid any contact with this dangerous plant. If its sap touches your skin, the toxic compounds can damage your skin cell DNA, making you extremely sensitive to sunlight. This heightened sensitivity can result in severe, blistering rashes resembling sunburn, which may take weeks or even months to heal.
Thankfully, encounters with this plant are uncommon. If the image above seems recognizable, it’s because giant hogweed has many lookalikes. We’ll soon explain how to distinguish it from similar plants. But first, here’s a map highlighting some (though not all) locations where giant hogweed has been spotted:
However, this map isn’t exhaustive—it omits several recent sightings, such as one in Virginia. Giant hogweed is classified as a noxious weed in most states. If you happen to find any, report it to your state’s agriculture department or the relevant authority handling invasive species. The plant aggressively displaces native wildflowers and, of course, poses a serious risk of causing severe burns. Authorities are just as eager to eradicate it as you are.
Learn to Identify Giant Hogweed
Giant hogweed truly earns its name, reaching heights of 10 to 15 feet. If you’ve spotted a smaller version in your yard or along the roadside, it’s likely Queen Anne’s Lace. Both plants belong to the same family as carrots, celery, and parsley, and they share a similar appearance.
Another family member, cow parsnip, also grows tall (up to eight feet) and resembles giant hogweed but is far less dangerous. Here’s a guide to distinguishing them. Cow parsnip features flat flower clusters instead of umbrella-shaped ones and is smaller, with leaves about two feet wide compared to giant hogweed’s five-foot leaves.
When in doubt, always follow the Golden Rule of the Outdoors: don’t touch it. (This advice also protects you from poison ivy and venomous creatures.)
Relatives of giant hogweed, such as celery and carrot plants, contain small amounts of the same rash-inducing chemicals (fumarocoumarins), but the levels are too low to pose a risk in everyday settings like gardens or grocery stores. However, those who harvest celery professionally might experience a milder form of this rash. Citrus plants also produce these compounds, which is why handling limes at the beach can lead to a severe reaction known as margarita burn.
Understand Its Mechanism
The sap of giant hogweed doesn’t cause immediate burns, so don’t assume you’re safe just because you brushed against the plant and feel fine afterward.
The sap makes your skin highly sensitive to sunlight. If you suspect you’ve come into contact with giant hogweed (or if you’re uncertain), here’s what you need to do:
Avoid sun exposure immediately.
Wash the affected area with soap and cold water (heat can exacerbate the reaction).
Stay out of the sun. The first 48 hours are critical, but if a rash develops, that area of your skin may remain sensitive for years.
If the sap gets into your eyes, rinse them thoroughly with water and wear sunglasses to protect them.
These tips are provided by New York State’s Department of Conservation. They offer extensive information on giant hogweed, as it’s relatively common in the state. However, their resource page starts with graphic images of the rash, showing its progression over time to illustrate just how long it takes to heal. Check it out here.
