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: Woodsorrel leaves and flower
Photo by: J.A. Kropf
  
Weeds : Oxalis (Creeping woodsorrel) : Oxalis corniculata
(revision date: 9/3/2015)

Family: Oxalidaceae
Cycle: Perennial
Plant Type: Broadleaf

Biology
Creeping woodsorrel is a prostrate plant, initially growing from a slender taproot. Branches lie flat on the ground, rooting at the nodes to form new plants. The leaves consist of three heart-shaped leaflets joined to a long petiole. Leaves are alternate and may be green to purplish or maroon in color. The leaves often close and droop at night. Flowers are borne in groups of one to five blossoms on slender stalks. Each flower has five yellow petals and is typically about 1/4 inch long. Seeds are borne in pointed, elongate capsules that open explosively when dry, especially if the plant is disturbed. The seeds are reddish and have a rough surface. Yellow woodsorrel (O. stricta) is very similar in appearance and habit, but has a more upright growth habit. SPECIAL INFORMATION: Plants in the genus Oxalis, including creeping woodsorrel, should be considered toxic, as they may accumulate high levels of oxalic acid in the plant tissues.
Habitat
Creeping woodsorrel can be found in cultivated areas including gardens, lawns, and flower beds, as well as waste places and roadsides. It can also be a greenhouse weed.

Management Options

Non-Chemical Management
  • Reduce weed establishment by maintaining a healthy planting or turf area to provide competition.
  • Weed infestation can be reduced by cultivation methods such as rototilling or hoeing, where practical.
Select non-chemical management options as your first choice!

Chemical Management

Apply according to label directions. 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
  • dichlobenil
Turf areas
  • triclopyr
Bare ground areas
  • triclopyr
Images

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Caption: Woodsorrel leaves and flower
Photo by: J.A. Kropf
Caption: Oxalis in mulch
Photo by: T. W. Miller
Caption: Oxalis near sidewalk
Photo by: T. W. Miller