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: Kochia showing fall color
Photo by: J.A. Kropf
  
Weeds : Kochia : Kochia scoparia
(revision date: 6/9/2014)

Family: Chenopodiaceae
Cycle: Annual
Plant Type: Broadleaf

Biology
Kochia has a single stem reaching one to six feet high. The main stem is branched above, but typically unbranched at the base. Leaves are soft, hairy, and lance-shaped, reaching up two inches long and 1/8 to 1/2 inch wide. Leaves are alternate on the smooth stems. Stems can be striped light and dark green or green and red. The entire plant may become reddish in autumn. Short, dense clusters of inconspicuous greenish flowers are borne in the leaf axils. Kochia seeds are dull brown, winged, and about 1/16 inch long. Seed are dispersed when the plant dries, breaks away at the base, and tumbles in the wind. Fivehook bassia (Bassia hyssopifolia) resembles kochia, but the seeds have five hooked appendages rather than wings. SPECIAL INFORMATION: Sometimes used as a forage plant, kochia can be toxic to animals due to accumulation of nitrates and other compounds in the plants. In WASHINGTON and OREGON, it is designated as a Class 'B' noxious weed. Management of this species may be required by law in your county. In addition, it is on both the Washington and Oregon noxious weed quarantine lists, which prohibit sale, purchase, and transport of plants, seeds, and plant parts. Consult your local Noxious Weed Control Board for more information.
Habitat
Kochia is found in cultivated areas including fields and gardens, as well as on roadsides, ditch banks, and other uncultivated or disturbed sites. It survives well in dry areas, and is not usually a problem in maintained lawn and turf.

Management Options

Non-Chemical Management
  • Reduce weed establishment by maintaining a healthy planting or turf area to provide competition.
  • Cultivation (rototilling or hoeing) will effectively eliminate plants.
  • Hand-pull to eliminate weeds.
  • Mowing to prevent seed production is a very effective means of management. In lawns, mowing regularly at the proper height for the grass species may help minimize weed growth and invasion.
  • 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 and glufosinate 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
  • glufosinate
  • products containing diquat
Turf areas
  • 2,4-D + MCPP + dicamba
Bare ground areas
  • glyphosate
  • products containing diquat
Images

+ Show larger images

 
Caption: Kochia showing fall color
Photo by: J.A. Kropf
Caption: Kochia flowers
Photo by: J.A. Kropf
Caption: Kochia along roadside
Photo by: J.A. Kropf
Caption: Kochia
Photo by: D.G. Swan
Caption: Kochia seedling
Photo by: J.A. Kropf