To recognize poison hemlock, look first for smooth, hollow stems marked with distinct purple blotches, plus large, finely divided fernlike leaves arranged alternately along the stem.
Mature plants are tall, often 3 to 8 feet (0.9 to 2.4 m), and carry many small white flowers in broad, umbrella-shaped clusters.
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Check the stem, leaves, and flower clusters of poison hemlock.
Avoid handling if the stem and foliage match these features.
Poison hemlock shows distinct visual shifts from early rosette growth to seed-bearing stems.
In spring, poison hemlock shows fresh, finely divided parsley-like leaves in a low basal rosette. By late spring to early summer, tall smooth stems with distinctive purple blotches become obvious, followed by broad clusters of small white flowers. After flowering in summer, the plant carries small ribbed seeds in drying umbels. By late summer or fall, plants usually turn brown and dry, leaving hollow, blotched stems standing for a time.
Several carrot-family plants are mistaken for poison hemlock.
wild carrot(Daucus carota)
Both have finely divided leaves and white flower clusters. Wild carrot is usually shorter, often under 4 feet (1.2 m), with hairy stems; Conium maculatum has smooth stems with purple blotches.
cow parsnip(Heracleum maximum)
Both make large white umbels. Cow parsnip has much larger, broad, lobed leaves, not fernlike leaves, and thick green stems without purple spotting.
sweet cicely(Osmorhiza claytonii)
Its divided leaves and white umbels can confuse beginners. Sweet cicely stays lower and has green, unspotted stems; the leaflets are broader and less finely cut.
Conium maculatum is native to Europe, western Asia, and North Africa. It is most often found in lowland disturbed places such as streambanks, ditch edges, roadsides, field margins, waste ground, and moist open woodland edges. That setting is useful for identification because this species commonly turns up in nutrient-rich, damp ground near human activity rather than in dry uplands, deep forest, or true wetlands. Habitat alone is not enough, but it helps narrow the possibilities.
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The clearest field mark is a smooth, hollow green stem marked with irregular purple blotches or streaks. The finely divided, fern-like leaves and flat-topped clusters of small white flowers support poison hemlock identification.
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