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DESCRIPTION:
Yellow starthistle is a long-lived winter annual broadleaf weed. Seedlings are dull green.Cotyledons (seed leaves) are
oblong, round at the tip, with smooth edges. The first true leaves are longer and narrower with short, white hairs on
the upper surface. Mature plants are 1 to 3 feet (30 - 90 cm) tall. The bases of
the grayish leaves extend
down the stem. The bright yellow flower heads have long stiff spines at their
base.
There is a parachute seed structure that is carried by the wind.
See UC IPM's Yellow Starthistle Pest Note
for more information.
Broadleaf ID illustration.
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