Spring-germinating, annual seed-propagated weed or perennial root-propagated weed. Reproduces chiefly through root or rhizome parts, seeds are wind dispersed over long distances. Plant parts contain milky latex. Likes fresh to moist, nitrogen-rich, humus-rich, deep loam or clay soils. It is generally indicative of underground moisture.
Field sowthistle [Sonchus arvensis]
Cotyledons have short stems, obovate, margins entire (Picture 1). In the weeds germinating from seed, the first true leaves are round-cordate, with rounded auricles (Picture 2). The later true leaves are shiny green, sinuate-pinnatifid, margins bristly-prickly serrated. The golden yellow flower heads are borne in terminal cymes (Picture 3). As many as 20,000 seeds can be produced per plant (Picture 4).