06/01/2026
Most know of poison ivy and poison oak.
Identifying these plants and having them removed can mean the difference between fun in the sun or a trip to a medical professional.
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Hemlock,
Specifically poison hemlock (Conium maculatum), is a highly toxic biennial plant in the carrot family, known for its hollow, purple-spotted stems, fern-like leaves, and white flowers in umbrella-shaped clusters. All parts are poisonous to humans and livestock, causing paralysis and death if ingested, and it's often mistaken for edible plants like parsley or wild carrot. It's an invasive w**d found in disturbed areas like roadsides, fields, and ditches, and should be handled with caution, avoiding skin contact and never burning it.
Identification
Stems: Hollow, hairless, ridged, and marked with distinctive purple or reddish spots/mottling.
Leaves: Fern-like, finely divided, and clasp the stem at the node.
Flowers: Small, white, and arranged in umbrella-shaped clusters (umbels) at the tips of branches.
Smell: Has an unpleasant odor, especially when crushed.
Size: Can grow up to 8 feet tall in its second year.
Dangers and Toxicity
Highly Toxic: All parts of the plant are poisonous and can be fatal if ingested by humans or animals.
Mistaken Identity: Often confused with edible plants like parsley, wild carrot (Queen Anne's Lace), and anise.
Symptoms of Poisoning: Include salivation, trembling, muscle weakness, paralysis, and respiratory failure.
Skin Irritant: Sap can cause dermatitis in sensitive individuals.
Burning: Never burn hemlock, as toxins can be released into the air.
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Giant hogw**d
(Heracleum mantegazzianum) is a large, invasive plant known for its toxic sap, which causes severe skin burns and blisters when exposed to sunlight (phototoxicity). It can grow up to 15 feet tall with large, deeply cut leaves and hollow stems with purple blotches and stiff hairs. Native to the Caucasus Mountains, it's a public safety hazard and a noxious w**d, often found along waterways, in fields, and disturbed areas, spreading via seeds.
Identification
Height: Can reach 8–20 feet tall.
Stems: Hollow, 2–4 inches in diameter, with purplish-red blotches and coarse white hairs.
Leaves: Very large (up to 5 feet wide), deeply incised, and lobed, with a shiny appearance.
Flowers: Large, white, umbrella-shaped clusters (umbels).
Look-alikes: Can be confused with cow parsnip, but cow parsnip stems lack purple blotches and are smaller.
Dangers
Toxic Sap: The clear sap is phototoxic, meaning it makes skin extremely sensitive to UV light.
Severe Burns: Contact with sap followed by sun exposure can cause painful blisters, rashes, and scarring that can last for years.
Eye Hazard: Sap can cause temporary or permanent blindness.
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Wild parsnip
(Pastinaca sativa) is a highly invasive plant. Its leaves, stems, and flowers contain toxic chemical compounds called furanocoumarins, which make your skin severely sensitive to sunlight and can cause agonizing chemical burns, blisters, and long-lasting skin discoloration.The
Reaction: Phytophotodermatitis
How it happens: If the plant's sap touches your skin and is then exposed to UV sunlight, it triggers a toxic chemical reaction known as phytophotodermatitis.
Symptoms: Redness and intense, localized burning usually appear within 24 to 48 hours, rapidly followed by painful blisters.
Long-term effects: Once the blisters heal, the affected skin can remain dark brown or discolored for up to two years.
How to Protect Yourself
Cover up: Always wear long pants, long-sleeved shirts, and gloves when hiking, mowing, or doing yard work in areas where wild parsnip grows.
Avoid contact: The plant has bright yellow, umbrella-shaped flat flower clusters and leaves that resemble celery. It commonly grows in open fields, roadsides, and disturbed areas.
What to Do If Exposed
Wash immediately: Immediately wash the exposed skin thoroughly with soap and water.Block the sun: Keep the exposed area completely covered and out of direct sunlight for at least 48 hours to prevent the reaction from occurring or worsening.
Treat symptoms: If a burn or blister develops, soothe the area with a cool, wet compress and consider applying corticosteroid or calamine lotion to reduce itching.
