Black Medic vs. White Clover: Why This Legume Isn't a Lawn Asset

Black medic (Medicago lupulina) is a legume like white clover, but its growth habit and lifecycle make it undesirable in managed turf despite nitrogen fixation.

Key Differences

Why Black Medic Is Problematic

• Creates bare spots when it dies in heat/drought
• Massive seed bank ensures persistent re-infestation
• Taproot doesn't knit turf — poor wear tolerance
• Indicates compacted, low-fertility soil (symptom, not solution)

Management

Cultural: Relieve compaction (aerate), raise fertility (compost + N), mow high (3+") — dense grass outcompetes annuals.

Organic pre-emergent: Corn gluten meal (20 lbs/1,000 sq ft) late summer/early fall.

Post-emergent: Hand-pull before seed set; iron-based herbicides (FeHEDTA) spot-treat.

White clover = lawn partner. Black medic = soil condition indicator. Fix the soil; the medic disappears.