Centaurea solstitialis
- An annual to short-lived weed that spreads by seed only
- Grows one to three feet tall
- Bright yellow flower heads are about 1 inch in diameter
- Inch-long spines form at ends of bracts under flowerheads
- Stems are winged, but not spiny
- Grows along roadsides and in waste areas and grasslands
- Pull, dig or mow at first sign of yellow flowers
- Chemical controls are available