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 crops in the northern parts of Europe and may cause substantial yield losses.
Yellow flowers (dandelion-like), abundant at the ends of stems. Sticky bracts. Prickles on edge of leaf. Milky sap. Lower leaves are deeply lobed with prickly edges. Grow to 2m (6.6 ft).
Native lookalike: Yellow False Dandelion