Weed Black medic
Scientific Name Medicago lupulina
Family Legume family (Fabaceae)
Life Cycle Annual or cool season perennial
Reproduction Method Reproduces by seed
Appearance Black medic is shallow rooted with multi-branched slender, prostrate, slightly hairy stems spreading 12 to 24 inches.
Leaves The alternately arranged, dark green leaves are compound with three, oval leaflets. The center leaflet is stalked and the side leaflets occur close to the stem. Leaves are sparsely hairy and the leaflets 1/5 to 3/5 inch long.
Flowers The 1/8 to 1/6 inch long bright yellow flowers are clustered on short stems that emerge from the leaf axils. Each cluster is approximately 1/2 inch long, round, and comprised of up to 50 individual flowers. Flowering occurs April to October.
Occurrence Black medic occurs in a variety of turf settings
Non Chemical Control Black medic can be hand pulled.
Chemical Control
Application Period Apply postemergence broadleaf herbicides during periods of active growth from late spring through early summer and again from early through mid autumn.
Active Ingredient in Labeled Products



  • dithiopyr
  • isoxaben
  • 2,4-D
  • 2,4-DP
  • clopyralid
  • dicamba
  • MCPA
  • MCPP
  • quenclorac
  • triclopyr

(Click on Image to Enlarge and Sharpen Photograph)

Black medic cotyledon

Black medic in turf

Black medic fruit

Black medic mature plant

Black medic seedhead

Black medic mature plant

Confused?? Look-a-Likes Black medic is often times confused with white clover and yellow woodsorrel. Click here for clarification.