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: Hairy bittercress rosette
Photo by: C.R. Foss
  
Weeds : Bittercress (Shotweed, Hairy bittercress) : Cardamine hirsuta
(revision date: 10/14/2016)

Family: Brassicaceae (Cruciferae)
Cycle: Winter annual
Plant Type: Broadleaf

Biology
Little bittercress is a fall/winter-germinating annual species growing to less than five inches tall. Leaves are compound with one large terminal leaflet and several pairs of smaller lateral leaflets. Each leaflet is smooth and circular to slightly heart-shaped in outline. Leaves initially form a flat rosette, followed by a flower stem ranging from 2 inches to a foot tall. Little bittercress blooms in early spring only, typically mid-March to mid-April. Its flowers are tiny and white, borne at the top of the plant. Fruits are slender, thin, and one to two inches long. When mature pods are touched, they split apart explosively, giving rise to the common name "shotweed."
Habitat
Little bittercress is commonly found west of the Cascades in yards, gardens, roadsides, waste areas, and perennial plantings. It is native to Europe, and has become a serious problem in the nursery industry.

Management Options

Non-Chemical Management
  • Maintaining a healthy planting or turf area to provide competition will prevent weed establishment.
  • Reduce weed infestation by handpulling weeds.
  • Apply organic mulches, such as bark, compost, grass clippings, straw, and other materials, in a layer from two to several inches thick for effective weed management.
Select non-chemical management options as your first choice!

Chemical Management

Seeds remain viable in the soil for several years. Preventing seed production is crucial for effective control. Apply according to label instructions. Glyphosate and glufosinate products are used 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
  • glufosinate
Turf areas
  • products containing 2,4-D
Bare ground areas
  • glyphosate
Images

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Caption: Hairy bittercress rosette
Photo by: C.R. Foss
Caption: Hairy bittercress fruits
Photo by: T. W. Miller
Caption: Hairy bittercress rosette
Photo by: T. W. Miller
Caption: Hairy bittercress
Photo by: T. W. Miller
Caption: Hairy bittercress rosette
Photo by: T. W. Miller