Controlling Clover in a Mature Lawn Without Damaging Desirable Grasses

Introduction

40-year-old lawn (SW Portland, OR) invaded by clover. Partial shade, old fir trees.

Treatment

• Herbicide: Spot-spray broadleaf herbicide (e.g., Roundup, 2,4-D) in **early fall** when daytime temps consistently <80°F.
• Do Not Spray in Summer Heat: Damages desirable grass.
• Fertilize: Late spring, early fall, late fall. Thick, fertilized turf suppresses clover.

Why It Works

Clover is a broadleaf weed; selective herbicides target it. Fall timing maximizes translocation to roots. Fertilization favors grass competition.

Conclusion

Early fall broadleaf herbicide + seasonal fertilizing eliminates clover while preserving mature turf.