Weeds: Black medic – Medicago lupulina

categories: A-B Weeds

revision date: 2024-06-21 04:40

  • Family: Fabaceae (Leguminosae)
  • Cycle: Annual
  • Plant type: Broadleaf
Black medic stem and leaves.
Black medic stem and leaves
Photo by: T.W. Miller

Biology

Black medic is very clover-like in appearance and is sometimes called Japanese clover. Leaves are alternate on the stems and divided into three leaflets. The center leaflet has a short, jointed stalk, while the side leaflets are without stalks. Each leaflet is broadest near the tip and slightly toothed at the tip only. The leaf veins are very obvious. A pair of stipules (small, leaflike appendages) are present where each petiole joins the main stem. The four-angled stems are prostrate or nearly so and branch from the base of the plant. Tiny yellow flowers are borne in small, dense clusters on stalks arising in the leaf axils. Individual flowers are about 1/8 inch long, while flower clusters are 1/2 to 3/4 inch long. Seeds are borne in small, kidney-shaped pods that turn black at maturity. The pods are hairy but not spiny. Black medic may be an annual or a short-lived perennial. California burclover, Medicago polymorpha, has spiny pods but otherwise resembles black medic in appearance.

Habitat

Black medic grows in gardens, lawns, and waste areas, commonly on poor soils.

Management Options

Use Integrated Pest Management (IPM) for successful plant problem management.

Non-chemical Management

Select non-chemical management options as your first choice!

  • Cultivation (rototilling or hoeing) will effectively eliminate plants.
  • Careful digging is useful to manage weed populations. However, digging can carry undesirable weed seed to the surface and foster further germination.

Chemical Management

IMPORTANT: Visit Home and Garden Fact Sheets for more information on using pesticides.

  • Apply according to label directions.
  • Glyphosate products should be applied as spot treatments only!
  • NOTE: Some ingredients listed here are only available in combination.
  • Read the label carefully on combination products to make sure the product is suitable for your specific situation.

Landscape areas

  • glyphosate
  • products containing triclopyr

Turf areas

  • 2,4-D + MCPP + dicamba
  • triclopyr

Bare ground areas

  • glyphosate
  • triclopyr

Additional Images