Cotton Thistle

Cotton Thistle (Onopordon) - Handsome vigorous Thistle-like plants mostly biennial, and valuable for their stately port and showy flowers. They thrive in exposed places and among shrubs in sheltered ones, and may be effectively used in a variety of ways. Moderation in their use, however, is desirable, as in some situations they seed so freely as to require judicious keeping down. O. Acanthium (Down Thistle) is a bold and vigorous native plant, with very large, stout branching stems, often more than 5 feet high, covered with long, whitish web-like hairs, and bearing large heads of purplish flowers. The habit of O. illyricum is more branching, the leaves and stems are much more spiny, the stems are stiffer and the leaves are greener and more deeply cut. O. arabicum is 8 to 10 feet high, is erect and very slightly branching, and both sides of the leaves, as well as the stems, are covered with white down. O. graecum is also a handsome plant.

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