| Description | An introduced plant that has become a pest in cultivation. |
|---|---|
| Pronunciation | (sen-TAR-ee-uh) |
| Plant Type | All Plants, Annuals, Weeds, Biennials |
| Hardiness Zone | 5 |
| Sunlight | full |
| Moisture | average |
| Soil & Site | average |
| Flowers | flower consists of disk flowers, purplish, the outer ring of disk flowers are sterile, grows as a biennial |
| Fruit | seeds are achenes, have short comb-like pappus (fluff) |
| Leaves | alternate, pinnatifid with narrow divisions, first year grows as a basal rosette of leaves |
| Stems | if touched can cause an irritation |
| Roots | forms a tap root, roots exude a natural herbicide to ward off other plants |
| Dimensions | 3 plus feet tall, erect |
| Propagation | spreads by seeds |
| Native Site | Native to Europe |
| Author's Notes | Wisconsin Point is a sand peninsula along Lake Superior. I read an article where a professor and his students where pulling this plant out. They were invasive and crowding out the native species and up setting the ecosystem. This is in zone #4. |
| Notes & Reference | #19-Common Weeds ( USDA Agricultural Research Service), #100-Wildflowers of Wisconsin and the Upper Midwest (Black and Judziewicz), #136-Weeds of the Northern US and Canada (France Royer, Richard Dickinson), |
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