Common Ragwort - Jacobaea vulgaris
Medium to tall plant, stems erect to 1.5 metres, branched above. Basal and lower leaves pinnately lobed, with a small end lobe, withering by flowering time. Upper leaves 1 to 2 pinnately lobed, half clasping the stem. Flowerheads bright golden yellow, 15 to 25 mm with 12 to 15 rays, borne in large, flat topped, branched clusters.
Oxford Ragwort, Hoary Ragwort and Marsh Ragwort
Dense flat-topped corymbs; terminal lobe of leaf not much larger than lateral lobes (much larger in Marsh Ragwort); supplementary phyllaries (bracts under flower head) less than half as long as main ones. Oxford Ragwort has looser corymbs and black-tipped phyllaries. Hoary Ragwort has leaves with dense greyish cottony hairs underneath, narrow lobes and longer supplementary phyllaries (about half as long as main ones).
Phyllaries often stated to be black-tipped, but this is not a key characteristic.
Check the leaf-shape and general growth habit
Waste and poor land, rough grassland, roadsides and banks.
June to November.
Biennial or perennial.
Common throughout Britain.
Common in Leicestershire and Rutland.
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Species profile
- Common names
- Common Ragwort
- Species group:
- Wildflowers
- Kingdom:
- Plantae
- Order:
- Asterales
- Family:
- Asteraceae
- Records on NatureSpot:
- 699
- First record:
- 11/05/1992 (John Mousley;Steve Grover)
- Last record:
- 02/02/2026 (Ramsell, Jean)
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Aphis jacobaeae
The aphid feed mainly on Ragwort species, although Groundsel may be used. The body length of Aphis jacobaeae apterae is 1.8 to 2.2 mm. Immatures and adults are greeny-black - all segments of the antennae are dark. The legs are dark except for the extreme bases of their femora.
Sphenella marginata
The larvae of the fly Sphenella marginata mine flowers of Ragworts and Groundsels. The flower head widens at is base, resulting in a cone shape; the bracts are widened. The affected flower heads contain one white maggot, or a brown puparium.
Puccinia lagenophorae
Puccinia lagenophorae is a gall-causing rust affecting stems and leaves of Common Groundsel, and occasionally Oxford Ragwort (Senecio squalidus) and Common Ragwort (Jacobaea vulgaris). It causes swelling and distortion of stems and leaves, with bright orange aecia. There are no uredinia or spermogonia, and the blackish-brown telia are rarely seen.
Cinnabar
The caterpillars of the Cinnabar moth feed on the leaves and flowers of Common Ragwort (Senecio jacobaea). Occasionally they are found on other ragworts and groundsels.
Ragwort Flea Beetle
2-4mm long, this golden brown beetle feeds on the leaves of Ragwort, particularly Common Ragwort. It can be found from June to October.





















