Killing Thorny Pasture Weeds Without Harming Cattle or Grass

Pasture has thorny plants with marble-sized fruit (likely Solanum carolinense – horse nettle, or Xanthium – cocklebur). Cows/goats eat fruit, spread seeds. Manual pulling fails. Needs selective control.

Spot-Treatment with Glyphosate (Roundup)

Method: Sponge/wiper application on calm, dry days (no rain 48 hrs). Wipe leaves only—no drips on grass.

• Glyphosate is non-selective but no soil residual—grass replants in days.
• Translocates to roots, kills whole plant in 4–7 days.
• Safe for grazing once dry (per label).

Why This Works

• Targeted—no broadcast spray drift.
• Low cost, no equipment.
• Repeat as new plants emerge.

Long-Term

Improve pasture density (fertilize, overseed) to outcompete weeds. Identify weed precisely—extension office can help. Some thorny weeds indicate overgrazing or low pH.

Expert: Brandon Swisher | BMSwisher@aol.com