Sonchus arvensis

Sonchus arvensis, the field milk thistle, field sowthistle, perennial sow-thistle, corn sow thistle, dindle, gutweed, swine thistle, or tree sow thistle, is a species of flowering plant in the daisy family Asteraceae. "S. arvensis" often occurs in annual crop fields and may cause substantial yield losses.
Description.
The plant grows up to in height, with leaves long and wide. It produces conspicuous yellow flowerheads about wide, which are visited by various types of insects—especially hoverflies of the genus "Eristalis".
Distribution.
"Sonchus arvensis" is native to Europe, where it is widespread across most of the continent. It has also become naturalized in many other regions, and is considered an invasive noxious weed in some places, such as North America (including Prince Edward Island), Russia, New Zealand, United Kingdom and Australia.
It grows in areas such as pastures, roadsides, bushlands and the shorelines of lakes, rivers and sea coast.
Uses.
The young leaves, when less than a few inches long and not bitter in taste, can be mixed with other greens to make salad. They can also be boiled in a small quantity of water, changed once. The plant can contain toxic nitrates.