Life
Cycle
·
Annual
Growth
Habit
·
·
Erect, up to 5-feet tall
Plant
Emergence
·
Seedlings in early spring
·
Flowers late May / June until frost
Characteristics
·
Deeply tap-rooted; reproduces by seed
·
Stiff, wiry, winged stems
·
3/4" yellow flowers covered with spines
·
Toxic to horses; causes "chewing disease"
Control
·
Grazing, mowing, burning, pulling, digging can be effective prior
to seed production
·
Apply Milestone; 2,4-D; Curtail; Banvel; or Tordon to actively
growing plants before flowering