Jacobaea vulgaris, commonly known as common ragwort, is a biennial or short-lived perennial herb native to Eurasia, often found in a variety of habitats including meadows, pastures, and areas of disturbed ground. It is particularly common in coastal areas, riverbanks, and along roadsides. This species is adaptable to a range of soil types but prefers nitrogen-rich soils. In its native range, it can play a role in supporting insect biodiversity, particularly for nectar-feeding insects. It typically grows to a height of 1-7 feet with a loose, corymb-like inflorescence of bright yellow flower heads that are about 0.5-1 inch in diameter, blooming from June to November. The leaves are dark green, pinnately lobed, and often have a ragged appearance.

Common ragwort is known for its ability to thrive in a variety of conditions, which contributes to its reputation as a noxious weed in many regions, including the UK. Despite its invasive potential, it is valued for its nectar production by beekeepers. In cultivation, it requires minimal care, tolerating poor soil and drought conditions. However, it is not typically grown in gardens due to its toxicity to livestock and its invasive nature. When grown outside its native range, it can outcompete native vegetation and become a serious pest. Gardeners should be cautious and check local regulations before planting.CC BY-SA 4.0