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Weeds and Plant Identification
Horseweed (marestail) - Conyza canadensis

Horseweed plant

New flowerhead

Rosette

Flowers
 

 
Horseweed (marestail) Conyza canadensis (L.) Cronq.
Asteraceae (Aster family)
 
Life cycle
Erect winter or summer annual.
 
Leaves
Cotyledons are egg- to spatula-shaped and hairless. Seedling leaves initially develop from a basal rosette; mature leaves are alternate and numerous, and crowded along an erect central stem. Leaves are hairy and linear to lance-shaped with smooth to toothed margins, gradually becoming smaller toward the top of the plant.
 
Stems
Erect, hairy central stem arises from a basal rosette, then branches to flower, reaching up to 7 feet tall. Flowering branches resemble a horse’s tail.
 
Flowers and fruit
Numerous clusters of small, white flower heads are found on many short branches near the top. Each seedhead is capable of producing thousands of small seeds; each seed is enclosed in a single-seeded, wind-disseminated fruit.
 
Reproduction
Seeds.

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