Clover in Zoysia: Why You Should Keep It, Not Kill It

A homeowner with Zoysia grass asked how to eliminate clover. The answer: don't. White clover is a nitrogen-fixing powerhouse that feeds your lawn for free, improves soil structure, and fills thin spots while Zoysia thickens.

Clover = Free Fertilizer

Clover hosts Rhizobia bacteria that convert atmospheric nitrogen into plant-available form. Studies show white clover can provide nitrogen equivalent to 175 lbs/acre of synthetic fertilizer—continuously, all season, with zero cost or burn risk. Crimson clover returns up to 100 lbs N/acre when tilled under.

Clover Benefits Beyond Nitrogen

• Grows in compacted soil, loosening it for grass roots
• Prevents thatch by supporting microbial decomposition
• Stays green in drought, keeping lawn visually uniform
• Flowers support pollinators; fragrance after rain is delightful
• Cannot be over-applied—self-regulates with grass competition

But First: Confirm It's Actually Clover

Black medic, birdsfoot trefoil, and yellow woodsorrel mimic clover but offer no nitrogen benefit. Check leaf markings: true clovers (white, red, crimson) have distinct pale crescents or "watermarks" on each leaflet. Compare photos at MSU Turf Weeds to identify yours.

If It's Black Medic: Manage It

• Mow Zoysia low (1–1.5″) to weaken upright broadleaf weeds
• Water deeply but infrequently—black medic prefers moisture
• Hand-pull small patches
• Apply corn gluten meal in spring to suppress seed germination

Once Zoysia reaches full density, it will crowd out clover naturally. Until then, let clover do the fertilizing work for you. It's not a weed—it's a partner.