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: Puncturevine
Photo by: R. Parker
  
Weeds : Puncturevine (Tackweed, Goathead) : Tribulus terrestris
(revision date: 6/9/2014)

Family: Zygophyllaceae
Cycle: Annual
Plant Type: Broadleaf

Biology
Puncturevine is a prostrate plant growing from a taproot. Above ground, the branching, trailing stems grow one to six feet and are green to reddish in color. Leaves are opposite. Each leaf is divided into four to eight (or more) pairs of 1/4- to 1/2-inch oval leaflets. Stems, petioles, and leaf undersides are hairy. The upper surfaces of leaves are slightly hairy to hairless. Small, yellow flowers with five petals are borne in the leaf axils. Seeds are borne in a woody, spiny bur consisting of five spined segments which separate at maturity. Spines are hard enough to stick into skin, leather, and tires, and are arranged so that at least one spine is always pointing upwards. SPECIAL INFORMATION: The sharp spines of puncturevine can injure humans and animals. The plant can be toxic to livestock, especially sheep. Puncturevine is designated as a Class 'B' noxious weed in WASHINGTON and OREGON. Management may be required by law in your county. In addition, it is on the Oregon noxious weed quarantine list, which prohibits sale, purchase, and transport of plants, seeds, and plant parts. Consult your local Noxious Weed Control Board for more information.
Habitat
Puncturevine grows along roadsides and railroads, in cultivated areas, and waste places. It can grow in compacted soil, sandy soils, or moist, rich soils. It can be a problem in low maintenance turfgrass in central Washington.

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.
  • Reduce weed infestation by handpulling weeds.
  • 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. Preemergence products can help suppress it. 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
  • oryzalin
  • glufosinate
  • products containing diquat
Turf areas
  • products containing 2,4-D
Bare ground areas
  • glyphosate
  • products containing diquat
Images

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Caption: Puncturevine
Photo by: R. Parker
Caption: Puncturevine flower and spiny bur
Photo by: D.G. Swan
Caption: Puncturevine thorns
Photo by: D.G. Swan
Caption: Puncturevine Puncturevine
Photo by: D.G. Swan
Caption: Puncturevine seedling
Photo by: D.G. Swan