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Winter Annual Weeds—Central Coast

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  • Annual bluegrass
  • Burning netttle
  • Common chickweed
  • Common groundsel
  • Little mallow (Cheeseweed)
  • Pineappleweed
  • Sheperd's-purse
  • Common sowthistle
  • Henbit

See also, winter annual weeds of other regions: Central Valley and Desert.

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

Click on photos to enlarge

Annual bluegrass
Annual bluegrass
(Poa annua): Grass family; winter annual; leaf tip shaped like bow of a boat; membranous ligule rounded with slightly pointed tip; leaf blade crinkled at midsection.

Burning nettle
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.
Common chickweed
(Stellaria media): Pink family; winter annual; seed leaves with prominent midveins, about 4 times longer than wide, tapering to point at tip; true leaves broader, opposite, and yellow-green.
Common groundsel
Common groundsel
(Senecio vulgaris): Sunflower family; winter annual; seed leaves narrow, with blunt narrow tip; first true leaves with shallow teeth; third and fourth leaves more deeply lobed.
Little mallow
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.

Pineappleweed seedling
(Chamomilla suaveolens): Sunflower family; summer or winter annual; seed leaves narrowly oblong to linear, fused at base, pointed or rounded at the tip; first true leaves opposite, smooth-edged or with feather-like lobes; later leaves alternate, with feather-like lobes, forming a rosette.

Sheperd'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.

Annual sowthistle seedling.
Common sowthistle
(Sonchus oleraceus): Sunflower family; summer annual; seed leaves markedly stalked, almost spoon-shaped, rounded at tip and often have grayish powdery bloom.
Henbit seedling, Lamium amplexicaule.
(Lamium amplexicaule): Mint family; winter annual; seedling leaves small, oblong, with smooth margins; first true leaves rounded, coarsely toothed, with visible netted veins.

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