Perennial sowthistle

Sonchus arvensis



Corn Sowthistle, Gutweed, Swine sowthistle

Importance

Likes wet heavy loams and rich clays. Scattered but serious where it does occur.

Perennial sowthistle - young1. Readily grows from root fragments but where seedlings occur, cotyledons are smooth, oval and short stalked. They are reddish-purple on the margins and light green in colour.
Perennial sowthistle 22. First leaves are also a long oval shape and short stalked, with a shiny appearance. True leaves are long and narrow, with toothed margins and form a rosette prior to stem extension and flowering.

 

Perennial sowthistle - mature3. This perennial is tall with bright yellow flowers, which are larger than those of the annual sowthistle species.