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: Blue mustard with flowers
Photo by: J.A. Kropf
  
Weeds : Blue mustard (Purple mustard, Tenella mustard) : Chorispora tenella
(revision date: 6/9/2014)

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

Use Integrated Pest Management (IPM) for successful weed management.

Biology
Blue mustard is a leafy, taprooted winter annual. Plants branch primarily from the base, with some branching of the flowering stems, as well. The rosette leaves of seedling plants are deeply lobed or toothed. Mature plants are six to eighteen inches tall, with nearly unlobed leaves that are toothed or wavy. Flowering stems are leafy on the lower portions. Both leaves and stems are covered with gland-tipped hairs which make the plants feel sticky. The four-petalled flowers appear in early spring, and are purple to somewhat pinkish. Seed-pods are thin, slightly curved, elongate and seedless (sterile) for about 1/3 of their length. Unlike the seed-pods of many other mustards, which split open along the length of the pod at maturity, blue mustard pods break apart crosswise into two-seeded sections.
Habitat
Blue mustard is a weed of fields and waste places. It is common east of the Cascades.

Management Options

Non-Chemical Management
  • Cultivation (rototilling or hoeing) will effectively eliminate plants.
  • 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

Apply according to label instructions. Not a problem in established turf areas. 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
  • dichlobenil
Turf areas
    Bare ground areas
    • glyphosate
    Images

    + Show larger images

     
    Caption: Blue mustard with flowers
    Photo by: J.A. Kropf
    Caption: Blue mustard with flowers
    Photo by: J.A. Kropf
    Caption: Blue mustard established in a field
    Photo by: J.A. Kropf
    Caption: Blue mustard rosette
    Photo by: J.A. Kropf