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Summer Annual Weeds—Central Coast

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  • Black nightshade
  • Hairy nightshade
  • Common lambsquarters
  • Nettleleaf goosefoot
  • Common purslane
  • Redroot pigweed

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

Winter annuals can also be active in the summer close to the coast. Use the photos below to identify weeds in the field. Names link to more information on identification and biology.

Click on photos to enlarge
Black	nightshade seedling.
Black nightshade
(Solanum nigrum): Nightshade family; summer annual or short-lived perennial; seed leaves oval and pointed; first true leaves spade shaped with smooth edges; lower surfaces often purple; petioles stems and leaves with some hairs.
Hairy	nightshade seedling.
Hairy nightshade
(Solanum physalifolium=Solanum sarrachoides): Nightshade family; summer annual; seed leaves narrow, small, and lance shaped with very short soft hairs along edges; first true leaves with wavy edges and prominent veins.
Seedling of common lambsquarters, Chenopodium album.
Common lambsquarters
(Chenopodium album): Goosefoot family; summer annual; seed leaves are narrow, with nearly parallel sides; seed leaves and early true leaves dull blue green above and often purple below; young leaves have mealy appearance from coating of  fine translucent granules.
Nettleleaf goosefoot
Nettleleaf goosefoot
(Chenopodium murale): Goosefoot family; summer annual; seed leaves oblong to narrowly lance shaped, dark green; true leaves weakly toothed, leaf surfaces, especially lower surface, sparsely covered with tiny dotlike scales.
Seedling of common purslane, Portulaca oleracea.
Common purslane
(Portulaca oleracea): Purslane family; summer annual; seed leaves oblong, somewhat club shaped, succulent, maroon on lower surface, and green or maroon on upper surface; young leaves smooth, succulent, oblong, green on upper surface, maroonish underneath, and broadest around leaf tip, with short petioles.
Redroot pigweed seedlings.
Redroot pigweed
(Amaranthus retroflexus): Pigweed family; summer annual; seed leaves long and narrow with red undersides; first true leaves with notched tips and much broader than seed leaves.

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