WSU Extension

Hortsense

Weeds
 
Annual bluegrass 
Barnyardgrass 
Bentgrass, creeping 
Bermudagrass 
Bittercress (Shotweed, Hairy bittercress) 
Bittersweet nightshade (European bittersweet) 
Black medic 
Blackberry (Himalayan, Evergreen, Pacific) 
Blue mustard (Purple mustard, Tenella mustard) 
Brackenfern, western 
Buffalobur 
Bull thistle 
Buttercup, creeping 
Canada thistle 
Catchweed bedstraw (Cleavers) 
Catsear, common (False dandelion) 
Chickweed, common and mouseear 
Clover 
Comfrey 
Crabgrass 
Dandelion 
Dock (Curly, Broadleaf) 
Dodder 
Downy brome (Cheatgrass, Downy chess) 
Dwarf mistletoes 
English daisy (Lawn daisy) 
English ivy 
Field bindweed (Wild morningglory) 
Field pennycress (Fanweed) 
Flixweed 
Foxtail (Green, Yellow, Bristly) 
Garden loosestrife 
Giant hogweed 
Goldenrods 
Groundsel, common 
Hawkweeds 
Hedge bindweed 
Henbit 
Herb Robert (Robert geranium, stinky Bob) 
Horsetails (Scouringrush) 
Horseweed (Marestail) 
Knapweeds 
Knotweeds (Bohemian, Giant, Japanese, Himalayan) 
Kochia 
Lambsquarters, common 
Liverworts 
Mallow, common (Cheeseweed, Buttonweed) 
Nightshades 
Oxalis (Creeping woodsorrel) 
Parrotfeather and Eurasian watermilfoil 
Pineappleweed 
Plantain (Broadleaf, Buckhorn) 
Poison hemlock 
Poison ivy and Poison oak 
Prickly lettuce (China lettuce) 
Prostrate knotweed 
Puncturevine (Tackweed, Goathead) 
Purple deadnettle (Red deadnettle) 
Purple loosestrife (Purple lythrum) 
Purslane, common 
Quackgrass 
Red sorrel (Sheep sorrel) 
Redroot pigweed (Rough pigweed) 
Redstem filaree (Stork's bill, Crane's bill) 
Reed canarygrass 
Russian thistle (Tumbleweed) 
Ryegrass, annual (Italian ryegrass) 
Salsify (Goatsbeard) 
Scotch broom 
Shepherd's-purse 
Smartweeds 
Sowthistle, annual and perennial 
Speedwells 
Spurges (Prostrate spurges) 
St. Johnswort, common (Goatweed, Klamathweed) 
Stinging nettle 
Tansy ragwort 
Tumblemustard (Jim Hill mustard) 
Velvetgrass (Common velvetgrass) 
Velvetleaf 
Water primrose 
Waterhemlock, western 
Yellow nutsedge 



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Caption: Black medic
Photo by: T.W. Miller
  
Weeds : Black medic : Medicago lupulina
(revision date: 10/11/2016)

Family: Fabaceae (Leguminosae)
Cycle: Annual
Plant Type: Broadleaf

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

Non-Chemical Management
  • 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.
Select non-chemical management options as your first choice!

Chemical Management

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
Turf areas
  • triclopyr
  • 2,4-D + MCPP + dicamba
Bare ground areas
  • glyphosate
  • triclopyr
Images

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Caption: Black medic
Photo by: T.W. Miller
Caption: Black medic
Photo by: T.W. Miller
Caption: Black medic flowers
Photo by: D.G. Swan
Caption: Black medic seedling
Photo by: D.G. Swan
Caption: Black medic patch
Photo by: J.A. Kropf