Common Ragwort
Perennial & invasive weed
Common ragwort is a striking native wildflower that can become an unwelcome weed in borders, rough ground and neglected corners. Its bright blooms support pollinators, including cinnabar moth caterpillars, but it needs careful management where horses, ponies, cattle or other livestock could reach it. It is best removed before seed develops.
How to identify it
Plants form a rosette first, then produce upright, branched stems usually 30-120 cm tall. The leaves are deeply cut into narrow, ragged-looking lobes and are often darker above than below. In summer, the stem tops carry broad, flat-topped clusters of small yellow daisy flowers. It has a stout taproot with fibrous side roots. After flowering, each head produces many light, downy seeds that travel readily on the wind.
Where it grows
It appears in sunny, open places from spring onwards, especially on bare or disturbed soil. In UK gardens it is common on rough lawns, path edges, neglected borders, wasteland and around paddock boundaries. Rosettes may overwinter, with flowering most noticeable from June to October. Seedlings establish particularly well where surrounding vegetation is sparse.
Why it is a problem
Common ragwort is poisonous to horses and other livestock if eaten, and is covered by injurious weeds legislation under the Weeds Act 1959. It should not be allowed to seed near grazing. Large plants also crowd out smaller garden plants and shed abundant seed. Away from livestock, a few plants may be tolerated for pollinators if contained carefully.
How to control it
Wear gloves and pull or dig out the whole plant, including the taproot, while soil is moist and before flowers set seed. Small rosettes are easiest to lift with a hand fork; hoe tiny seedlings in dry weather. Check the site regularly for replacements from the seed bank and mulch cleared bare soil. Remove plants promptly and dispose of them properly; do not leave them to wilt where animals graze. Seek guidance from the RHS or a local garden centre if needed.
Commonly confused with
It can be confused with other yellow composites, especially common groundsel and hawkweeds. Ragwort's ragged, deeply divided leaves and broad, flat-topped flower clusters are useful clues. St John's wort has yellow flowers too, but its leaves are undivided and its flowers are larger and star-shaped.
Common Ragwort: frequently asked questions
How do I identify common ragwort?
Plants form a rosette first, then produce upright, branched stems usually 30-120 cm tall.
How do I get rid of common ragwort?
Wear gloves and pull or dig out the whole plant, including the taproot, while soil is moist and before flowers set seed.
Where does common ragwort grow?
It appears in sunny, open places from spring onwards, especially on bare or disturbed soil.
General guidance for UK gardens and allotments, focused on prevention and non-chemical control. For a confirmed identification, the RHS or a local garden centre can help. Page updated 19 Sep 2026.