Chiba University Matsudo/Kashiwa Campus Plant Database

Details of genus: Onopordum [2559]

genus_ja:

genus_en: Cotton thistle, Scotch thistle

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Family: Asteraceae

family_ja: キク

Infra familial classification:

distribution_en:

description_en: Genus of about 40 erect, rosette-forming biennials from steppes, stony slopes, fallow fields, and disturbed ground in Europe, the Mediterranean, and W. Asia. They have simple to pinnatifid or pinnatisect, spiny-toothed leaves covered in cobweb-like, soft grey hair; the leaves are borne alternately on coarse, usually freely branching, mostly white-woolly stems, the leaf bases often continuing down the stems as very conspicuous wings. Large, round flowerheads, typically thistle-like and without ray-florets, are produced singly or in tight clusters at the stem tips in summer. They may be bright purple, blue-violet, rose-pink, or occasionally white, and are attractive to bees. Cotton thistles readily self-seed and may be grown in a large border, or in a semi-wild or gravel garden.

hardiness_en: Fully hardy.

cultivation_en:

propagation_en: Sow seed in containers in a cold frame or in situ in autumn or spring.

pests_en: Slugs and snails may damage the foliage.

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Update Information: Created: 2010-06-04 18:58; Updated: 2020-07-05 11:42

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