Use 1.3 to 2.5 fluid ounces of Trimec per gallon of water

The standard mixing rate for Trimec broadleaf herbicide is 1.3 to 2.5 oz per gallon of water for most turfgrass applications. Always check the label for target weeds, grass type, and environmental conditions, as rates may vary. For spot treatments, use the higher end; for large areas, the lower end often suffices.

Key Factors Affecting Trimec Mixing Rates

  • Weed type: Tough weeds (e.g., clover, dandelion) may require 2.5 oz/gallon, while lighter infestations need 1.3-1.5 oz/gallon.
  • Grass tolerance: Cool-season grasses (e.g., fescue, bluegrass) handle higher rates better than warm-season types (e.g., Bermudagrass, Zoysia).
  • Temperature: Avoid applying above 85°F (29°C)-increase dilution to 1 oz/gallon in heat to reduce stress.
  • Surfactant: Add 0.25-0.5 oz non-ionic surfactant per gallon to improve coverage, especially for waxy-leaf weeds.

Trimec Mixing Ratios by Application Type

Application Type Trimec per Gallon Water Volume per 1,000 sq ft Best For
Spot Treatment 2.0-2.5 oz 0.5-1 gallon Heavy weed infestations, driveways, sidewalks
Broadcast Spray 1.3-1.8 oz 1-2 gallons Large lawns, preventive maintenance
Cool-Season Grass 1.5-2.0 oz 1 gallon Kentucky bluegrass, tall fescue, perennial ryegrass
Warm-Season Grass 1.0-1.5 oz 1 gallon Bermudagrass, Zoysia, St. Augustine (test small areas first)

Step-by-Step Mixing Instructions

  1. Calculate total spray volume: Measure your lawn's square footage. Use 1-2 gallons per 1,000 sq ft for even coverage.
  2. Fill sprayer halfway with water: This helps agitate the concentrate evenly.
  3. Add Trimec: Pour the measured amount (e.g., 1.5 oz per gallon) into the sprayer.
  4. Add surfactant (if needed):strong> Use 0.25 oz per gallon for better adhesion.
  5. Top off with water: Fill to the desired volume and shake gently to mix.
  6. Test spray: Apply to a small area first to check for grass sensitivity.

Safety and Application Tips

  • Avoid overspray: Trimec can damage nearby plants, trees, and vegetables.
  • Timing: Apply in early morning or late afternoon to reduce evaporation.
  • Rainfastness: Allow 6-8 hours of dry time post-application to prevent wash-off.
  • Reapplication: Wait 3-4 weeks between treatments; do not exceed 3 applications per year.
  • Storage: Store mixed solution in a cool, dark place and use within 24 hours for best results.

Signs of Overapplication

  • Yellowing or browning of grass within 2-3 days.
  • Stunted growth or curled leaves on turf.
  • Excessive weed die-off followed by bare patches.
  • Nearby non-target plants showing leaf burn or wilting.

If overapplication occurs, water the area deeply to dilute the herbicide.