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DESCRIPTION:
Horseweed, also called mare's tail, is a summer annual or biennial broadleaf. If undisturbed,
the plant grows erect, branching only near the top. Cotyledons (seed leaves) are oval with
fine hairs. Leaves of young plants grow as a
rosette around a crown. Later plants grow
erect and an abundance of dark green leaves alternate along the stem. Small, yellowish flower heads are borne at the end
of branched stems and are slightly larger than those of horseweed.Mature plants can reach up
to 10 feet (3 m) tall. Shorter, mowed plants may look
similar to hairy fleabane, but horseweed has
dark green leaves while hairy fleabane has gray-green leaves. It competes severely for water
and grows rapidly.
Broadleaf ID illustration.
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