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DESCRIPTION:
Annual sowthistle is a widespread annual weed. It is commonly found in
California's Central Valley and coastal areas where it grows year-round.
Its seeds germinate only in the top 1/2 inch (1.2 cm) of soil, so preplant
cultivations and deep plowing are effective controls. Seed leaves are
stalked and covered with a powdery, gray bloom. They have smooth-edges and
are spoon-shaped. True leaves have wavy edges and prickles. Upper leaf
bases clasp the stems with clawlike lobes. Mature plant may reach a height
of 3 to 6 feet (0.9 - 1.8 m). Yellow flowers mature into white, fluffy seed
heads, similar to common groundsel. Hollow stems secrete milky juice when cut
or crushed.
Broadleaf ID illustration.
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