Cole Crops

Summer Annual Weeds

ON THIS PAGE:
  • Annual sowthistle
  • Barnyardgrass
  • Black nightshade
  • Burning nettle
  • Common lambsquarters
  • Common purslane
  • Groundcherries
  • Hairy nightshade
  • Nettleleaf goosefoot
  • Pineappleweed
  • Prickly lettuce
  • Prostrate knotweed
  • Redroot pigweed
Click on photos to enlarge. Names link to more information on identification and management.
Annual sowthistle seedling.

Annual sowthistle (Sonchus oleraceus): Sunflower family; summer or winter annual; seed leaves markedly stalked, almost spoon-shaped, rounded at tip and often have grayish powdery bloom; injured tissue bleeds milky white latex.

Seedling of barnyardgrass, Echinochloa crus-galli.

Barnyardgrass (Echinochloa crus-galli) Grass family; first leaf dull gray green; stem flattened, purplish; no ligule.

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.

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.

Seedling of common lambsquarters, Chenopodium album.

Common lambsquarters (Chenopodium album): Goosefoot family; 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.

Seedling of common purslane, Portulaca oleracea.

Common purslane (Portulaca oleracea): Purslane family; 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.

Groundcherry seedling.

Groundcherries (Physalis spp.): Nightshade family; summer annual or perennial; seed leaves yellow green to gray green; first leaves oval to triangular, with smooth or slightly wavy margins, and a strong odor when crushed.

Hairy nightshade seedling.

Hairy nightshade (Solanum physalifolium=Solanum sarrachoides): Nightshade family; 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 nettleleaf goosefoot.

Nettleleaf goosefoot (Chenopodium murale): Goosefoot family; 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 pineapple-weed, Chamomilla suaveolens, at the four-leaf stage.

Pineappleweed (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.

Seedling of prickly lettuce, Lactuca serriola.

Prickly lettuce (Lactuca serriola): Sunflower family; summer or winter annual or biennial; seed leaves about 2 times longer than wide; first true leaves with rounded margins; injured tissue bleeds milky white latex.

Seedling of common knotweed (prostrate knotweed), Polygonum arenastrum.

Prostrate knotweed (Polygonum arenastrum): Knotweed family; seed leaves are long, very narrow, rounded at the tip and light green with a white cast; true leaves are much broader, emerging from an encircling, membranous sheath at the leaf base.

Redroot pigweed seedlings.

Redroot pigweed (Amaranthus retroflexus): Pigweed family; seed leaves long and narrow with red undersides; first true leaves with notched tips and much broader than seed leaves.

   

Statewide IPM Program, Agriculture and Natural Resources, University of California
All contents copyright © 2014 The Regents of the University of California. All rights reserved.

For noncommercial purposes only, any Web site may link directly to this page. FOR ALL OTHER USES or more information, read Legal Notices. Unfortunately, we cannot provide individual solutions to specific pest problems. See our Home page, or in the U.S., contact your local Cooperative Extension office for assistance.

Agriculture and Natural Resources, University of California

Accessibility   /PMG/C108/m108spsmrannlweed.html revised: January 8, 2014. Contact webmaster.