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Is it large hop clover or black medic?

November 13, 2017 · Corteva Agriscience

Large hop clover (Trifolium campestre) and black medic (Medicago lupulina) are often confused as a result of their similar yellow flowers. Learn how to differentiate the two with these helpful identification tips.

Large hop clover

Photo Credit: John D. Byrd, Mississippi State University, Bugwood.org

What to look for: Sprawling growth habit and bushy appearance; trifoliate leaves similar to white clover, short, hairy stems, reddish in color Life cycle: Winter annual; spreads by reseeding itself; often forms colonies Leaves: Alternate leaves are trifoliate with long, hairless petioles; leaflets have prominent veins, with the terminal leaflet on a short stem Flowers: Bright yellow flowers grow in clusters during summer months; each produces a single seed Roots: Grows from a taproot, which can form nodules on secondary roots Look-alikes: Black medic, yellow woodsorrel, other clovers Commonly found: Sunny, moist sites

Black medic

What to look for: Low-growing habit; bright yellow flowers and leaf arrangement Life cycle: Annual or perennial that germinates in spring or fall; reproduces by seed Leaves: Fully divided into three egg-shaped leaflets with toothed edges; stalk of the middle leaflet is longer than those of lateral leaflets Flowers: Bright yellow flowers bloom from April through July; 10 to 20 pealike flowers cluster to form a rounded flower head Roots: Grows from a taproot Look-alikes: Large hop clover, California burclover, yellow woodsorrel Commonly found: Lawns stressed from compaction, heat and drought

Treatment recommendations for large hop clover and black medic

Apply a postemergence herbicide, such as Defendor® specialty herbicide, when the plants are young and actively growing. Black medic and clover species are particularly susceptible to products containing florasulam, the active ingredient in Defendor. Because Defendor works well in cooler temperatures, time your application in early spring or fall. State restrictions on the sale and use of Defendor apply. Consult the label before purchase or use for full details.

Posted In: Weeds 101
Tagged: black medic, clover, Defendor

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