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Winter Annual Weeds—Post Planting

On this page
  • Burning nettle
  • Italian ryegrass
  • Little mallow
  • Mustards
  • Prickly lettuce
  • Sherperd's-purse
  • Sowthistle
  • Tall annual willowherb

Use the photos below to identify weeds in the field. Names link to more information on identification and biology.

Click on photos to enlarge

Burning nettle 
				seedling.
Burning nettle
(Urtica urens): Nettle family; winter or summer annual; rounded seed leaves with smooth margin and small notch at tip; first true leaves with small notch at tip, opposite, stalked, and distinctly toothed.

Shiny, 
				varnished appearance of ryegrass seedlings.
Italian ryegrass
(Lolium multiflorum): Grass family; winter annual; first blade erect, long, and narrow; leaves rolled in bud, blades with shiny, varnished appearance; ligule membranous; usually auricles present, but sometimes absent on very young seedlings.

Little mallow, Malva 
				parviflora, seedling.
Little mallow (cheeseweed)
(Malva parviflora): Mallow family; winter annual; seed leaves heart shaped, sometimes with red tinge; true leaves roundish with wavy, shallow-toothed margins.
Mustard 
				seedling.
Mustards
(Brassica spp.): Mustard family; winter annual; all mustard seedlings with broad seed leaves and deep notch at tip; first true leaves bright green on the upper surface and paler below.
Seedling of 
				prickly lettuce, Lactuca serriola.
Prickly lettuce
(Lactuca serriola): Sunflower family; winter annual or biennial; seed leaves about 2 times longer than wide; first true leaves with rounded margins.
Shepherd's-purse seedling.
Shepherd's-purse
(Capsella bursa-pastoris): Mustard family; winter annual; seed leaves pale green with tiny granules on surface; first true leaves with smooth margins; fourth and later leaves may be indented; true leaves covered with star-shaped hairs.
Sowthistle seedling
Sowthistle
(Sonchus spp.): Sunflower family; summer annual; seed leaves markedly stalked, almost spoon-shaped, rounded at tip and often have grayish powdery bloom.
Seedling of panicle-leaf willowherb, Epilobium brachycarpum, at the four-leaf stage.
Tall annual willowherb
(Epibolium brachycarpum): Primrose family; summer annual; seed leaves small, round, often dark reddish- green; true leaves narrow, 4 to 5 times longer than wide, first true leaves opposite and smooth around edges.

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