Black medic is more active on soils low in nitrogen fertility. The leaf is similar to clover and other legumes, having three leaflets. Black medic s center leaflet is on a separate petiole. The flower of black medic is a compressed cluster of bright yellow flowers in the shape of a globular spike on short branches. The seed pod will turn black at maturity.
Black medic produces viable seed under normal mowing conditions.
Black medic is found throughout the continental United States. Soil testing can confirm low phosphorus levels.