Sonchus arvensis, commonly known as field milk thistle or perennial sow-thistle, is a perennial herb native to Eurasia. It thrives in a variety of habitats including disturbed sites, agricultural land, riverbanks, and roadsides. In its native range, it is often found in open fields and along the edges of fields and pastures. This plant typically grows up to 5 feet tall with a robust form. Its leaves are 4-14 inches long and 2-6 inches wide, with a wavy or lobed margin, and they clasp the stem with a basal auricle. From mid-summer to early fall, it produces bright yellow flower heads that are attractive to insects such as hoverflies and bees, adding to its ecological value.

Field milk thistle is known for its rapid growth and ability to spread, which can be beneficial in covering bare ground quickly. However, it is considered an invasive noxious weed outside its native range, particularly in North America, Russia, New Zealand, and Australia. It is not recommended for ornamental planting due to its invasive nature and potential to outcompete native vegetation. In cultivation, it prefers full sun to partial shade and can tolerate a wide range of soil types, but it thrives in moist, well-drained soils. Gardeners should be cautious and check local regulations before planting, as it may be restricted or banned in some areas due to its invasiveness.CC BY-SA 4.0