Centaurea stoebe
Short-lived perennial with multiple stems per rosette. Bluish-gray leaves and setms. Flowers are purple; flower head bracts are black-tipped.
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Shade Preference | |
Mature Height | 3' |
Distribution | found across Oregon |
Control | Repeated mowing can be effective before the plants go to seed; after this point mowing will spread seeds. Small infestations can be pulled while wearing gloves; the area will need to be moitored and repulled for several years. |
Disposal Methods | If seed heads are removed, bag and seal and dispose of them in the landfill. |
Reproduction and Spread | Spreads by seed with contaminated equipment along disturbed sites - Ditches, field margins, railroad lines, etc. |
Introduced | Native to Central, Eastern, and Southeastern Europe. Maybe have entered US as a contaminant in alfalfa seed as early as 1893. |
Look Alikes | Other knapweeds |
Impact | Infestations can increase runoff and erosion and dominate the landscape. |
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