Grassburs only grow in poor soil. The best approach to controlling this weed is to attack it before it germinates through the use of humic acid and corn gluten meal.

• In late February or early March, apply corn gluten meal at 20 pounds per 1,000 square feet.
• In early spring, apply humate to the infested area and water in if there is no rainfall. Use 6-15 pounds per 1,000 square foot or 300 pounds per acre. Humate can be found in most garden shops.