Controlling White Clover in Lawns: Biology and Herbicide Options

Understanding White Clover

White clover (Trifolium spp.) is a legume that fixes atmospheric nitrogen via root bacteria, enriching soil. It spreads by seeds and stolons, thrives in cool weather, and indicates low soil nitrogen only indirectly—it simply exploits niches where grass is thin.

Why Weed-and-Feed Failed

• Clover is a perennial broadleaf weed; pre-emergent in weed-and-feed doesn't affect established plants.
• Post-emergent component may be insufficient concentration or wrong chemistry for clover.
• Seeds persist in soil for years, requiring repeated treatment.

Effective Chemical Control

Post-Emergent (for existing clover)

Look for products containing all three of these active ingredients:

• 2,4-D (often sold as Weed-B-Gon)
• MCPP (Mecoprop)
• Dicamba

Apply as liquid spot spray in early fall (best) or spring. Multiple applications usually needed. Follow label: temps <85°F, no rain 24 hrs, don't mow 2-3 days before/after.

Pre-Emergent (for prevention)

Apply in late winter/early spring. Effective brands: Dimension, Gallery, Pendulum, Surflan, others. Suspend when overseeding.

Severe Infestations

Glyphosate (Round-Up) kills everything. Reseed/sod after 10-14 days.

Cultural Suppression

• Mow high (3+ inches): Shades out low-growing clover.
• Bag clippings when clover flowers: Removes seeds.
• Improve soil fertility: Dense, vigorous grass outcompetes clover.
• Correct pH: Clover tolerates acidic soil better than grasses.

Perspective

Some homeowners keep clover for its nitrogen-fixing, pollinator benefits, and drought tolerance. Microclover varieties are bred for lawn compatibility. Decide your tolerance level before investing in eradication.