Annual sowthistles

Sonchus oleraceus (Smooth sowthistle)


Sonchus asper (Prickly sowthistle, Common sowthistle, Milk thistle, Dindle)

Importance

Common in all crops, woodlands and wasteland.

Annual sowthistle 11. Seedlings of the various species are difficult to seperate. In this stage, they differ from perennial sowthistle in that the blade of the first true leaf is cut away abruptly at the stalk.
Annual sowthistle 2Young plants of both species form a thistle-like rosette. Smooth sowthistle leaves are soft, not spiny whereas those of the prickly sowthistle are stiff, with prickly, spiny teeth.

 

Annual sowthistle 33. An upright annual.