perennial sowthistle USDA PLANTS SYMBOL: SOAR2
Sonchus arvensis L.
Synonym(s): field sowthistle, creeping sowthistle, field sow-thistle

Perennial sowthistle is a perennial herb native to Eurasia. Stems can reach 4.9 ft. (1.5 m) in height and contain milky sap. Leaves are sessile, alternate, clasping, up to 12 in. (30 cm) long and decrease in size further up the stem, margins undulate with sharp spines. Flowering occurs in June to October, when yellow, tight, dandelion-like flower heads develop at the tips of the branches. Flowers open 2-3 hours after sunrise and close about noon. Fruits are reddish, ribbed and have a tuft of hair (pappus) at the top. Perennial sowthistle occurs along roadsides, railroads and other disturbed habitat.

Identification, Biology, Control and Management Resources

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Flower(s);
Theodore Webster, USDA Agricultural Research Service, Bugwood.org
Additional Resolutions & Image Usage

Flower(s);
Ohio State Weed Lab Archive, The Ohio State University, Bugwood.org
Additional Resolutions & Image Usage

Fruit(s);
Ken Chamberlain, The Ohio State University, Bugwood.org
Additional Resolutions & Image Usage