Douglas County Conservation District
SERVING LANDOWNERS IN DOUGLAS COUNTY COLORADO FOR OVER 56 YEARS
PO BOX 688, 7519A E HWY 86, FRANKTOWN, CO 80116 303-218-2622 DCCDistrict@gmail.com
Rosettes (pictured above) appear in early spring as deeply lobed leaves radiating from a common point. Herbicides are most effective when applied at this growth stage.
Knapweeds readily establish themselves on any disturbed soil, and their early spring growth makes them competitive for soil moisture and nutrients. There is some evidence that knapweeds release chemical substances which inhibit surrounding vegetation. The flowering period extends from June to October.