Bull thistle (Cirsium vulgare) Public Deposited

http://ir.library.oregonstate.edu/concern/administrative_report_or_publications/gq67jr366

Published September 2008. Reviewed December 2013. Please look for up-to-date information in the OSU Extension Catalog:  http://extension.oregonstate.edu/catalog

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  • Bull thistle is native to Europe, western Asia, and North Africa. It probably was introduced in eastern North America during colonial times, as a contaminant in seed or ship ballast. It is now the most widespread of the thistles in the United States (Figure 3, next page) and is commonly found in disturbed areas such as roadsides and burned or newly logged forests. It invades a variety of habitats where it displaces native plants by out competing them for water, nutrients, and space. It does not grow well in shade. Bull thistle reproduces only by seed. Individual plants set seed before dying, and a single large plant can produce tens of thousands of seeds.
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