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: Yellow nutsedge
Photo by: Washington Noxious Weed Board slide collection
  
Weeds : Yellow nutsedge : Cyperus esculentus
(revision date: 6/9/2014)

Family: Cyperaceae
Cycle: Perennial
Plant Type: Broadleaf

Biology
Yellow nutsedge is an aggressive, creeping perennial that resembles a grass but has triangular stems. Plants range in height from 6 to 30 inches tall. True leaves originate from the base of each stem. Leaves and stems have a waxy or shiny appearance. Flower spikelets are yellowish-brown and borne on the ends of slender branches above three long, leaf-like bracts. Yellow nutsedge can spread by seed, creeping rootstocks, or by small underground nutlets. These nutlets may lie dormant in the soil for several years before developing into new plants. SPECIAL INFORMATION: Yellow nutsedge is designated as a Class 'B' noxious weed in both WASHINGTON and OREGON. Management of this species may be required by law in your county. Consult your local Noxious Weed Control Board for more information.
Habitat
Yellow nutsedge thrives in areas with warm summers or mild winters. It prefers moist and sandy/loamy soils. One of the world's most significant weeds, yellow nutsedge can occasionally be found in Pacific Northwest landscapes and gardens.

Management Options

Non-Chemical Management
  • Maintaining a healthy planting or turf area to provide competition will prevent weed establishment.
Select non-chemical management options as your first choice!

Chemical Management

Apply according to label instructions. Use glyphosate products as spot treatments only! Mulching is ineffective. 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
    Bare ground areas
    • glyphosate
    Images

    + Show larger images

     
    Caption: Yellow nutsedge
    Photo by: Washington Noxious Weed Board slide collection
    Caption: Yellow nutsedge roots and nutlets
    Photo by: R. Parker
    Caption: Yellow nutsedge flowers
    Photo by: R. Parker
    Caption: Yellow nutsedge in field
    Photo by: C.A. Rice
    Caption: Yellow nutsedge bulb sprout
    Photo by: C.A. Rice
    Caption: Yellow nutsedge triangular stem
    Photo by: C.A. Rice