Sow thistle most often refers to yellow flowered,

thistle Thistle is the common name of a group of flowering plants characterised by leaves with sharp prickles on the margins, mostly in the family Asteraceae. Prickles can also occur all over the planton the stem and on the flat parts of the leaves. ...

-like plants in the genus ''

Sonchus ''Sonchus'' is a genus of flowering plants in the tribe Cichorieae within the family Asteraceae and are commonly known as sow thistles (less commonly hare thistles or hare lettuces). Sowthistles are annual, biennial or perennial herbs, with or w ...

'' Sow thistle may also refer to *'' Cicerbita'', a genus of plants related to ''Sonchus'', with blue, white, or yellow flowers.

See also