UC IPM Online UC ANR home page UC IPM home page


SKIP navigation



Summer Annual Weed Seedlings

On this page
  • Burning nettle
  • Common lambsquarters
  • Prosrate pigweed
  • Spotted spurge
  • Barnyardgrass
  • Black nightshade
  • Hairy fleabane
  • Horseweed
  • Large crabgrass
  • Morningglories
  • Puncturevine
  • Purple cudweed
  • Tall annual willowherb
  • Yellow foxtail

Names link to more information on identification and biology.

Click on photos to enlarge
In all California grape-growing regions

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; summer annual; seed leaves are narrow, with nearly parallel sides; seed leaves and early true leaves dull blue-green above and often purple below.
Seedling of prostrate pigweed, Amaranthus blitoides, at the two-leaf stage.
Prostrate pigweed
(Amaranthus blitoides): Pigweed family; summer annual; seed leaves narrow, pointed, 6 to 8 times longer than wide, with magenta undersides; first true leaves broader, with shiny upper surface and usually magenta-tinged undersides; edges somewhat rough.
Spotted spurge seedling.
Spotted spurge
(Chamaesyce maculata): Spurge family; summer annual; seed leaves oval, tips roundish, blue-green with smooth margin; first true leaves rounded, leaf surface smooth and dull, dark green with reddish tinge.
All regions except Coachella Valley—Top of page
Seedling of barnyardgrass, Echinochloa crus-galli.
(Echinochloa crus-galli) Grass family; summer annual; first leaf dull gray-green; stem flattened, purplish; no ligule.
Black nightshade seedling.
Black nightshade
(Solanum nigrum): Nightshade family; summer annual; seed leaves oval and pointed; first true leaves spade shaped with smooth edges; lower surfaces often purple; petioles stems and leaves with some hairs.
Seedling of hairy fleabane, Conyza bonariensis, at the four-leaf stage.
Hairy fleabane
(Conyza bonariensis): Sunflower family; summer annual; seed leaves gray-green; first leaves narrow and covered with short, soft hairs; often wrinkled or distorted.
Horseweed seedling.
(Conyza canadensis): Sunflower family; summer annual; seed leaves dull green, oval with fine hairs, and with short stalks that sometimes may be tinged with brown-purple; first true leaves covered with hairs on upper surface and margins; undersides of early leaves smooth.
Crabgrass seedling.
Large crabgrass
(Digitaria sanguinalis): Grass family; summer annual; first leaf blade linear to lance shaped, with stiff, jagged, and papery ligule; hairs on margins of the collar wide; no auricles; leaves covered with coarse hairs; leaves rolled in bud.
Seedling of 
				annual morningglory
(Ipomoea spp.): Morningglory family; summer annual; seed leaves deeply notched; heart-shaped first true leaves with deep lobes at base; stem below seed leaves maroon at base and green toward leaf tip.

Puncturevine seedling.
(Tribulus terrestris): Caltrop family; summer annual; seed leaves thick, brittle, 2 to 3 times longer than wide; petioles pinkish; true leaves dark green with grayish underside and rough margins.

Seedling of purple cudweed, Gnaphalium purpureum, at the four-leaf stage.
Purple cudweed
(Gnaphalium purpureum): Sunflower family; winter annual, summer annual, or biennial; seed leaves and first true leaves covered on both sides with whitish hairs; seed leaves 2 to 3 times longer than wide.

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.

Seedling of yellow foxtail, Setaria pumila, at the four-leaf stage.
Yellow foxtail
(Setaria pumila): Grass family; summer annual; first blade linear, roughly 7 times longer than wide and opens almost parallel to ground; leaves rolled in bud; ligule—fringe of hairs; no auricles; no hairs on leaf-sheath margin below collar; leaf blades of young seedlings smooth on lower surface, with long hairs on basal area of upper surface; margins smooth or slightly rough.

Top of page

Statewide IPM Program, Agriculture and Natural Resources, University of California
All contents copyright © 2016 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/C302/mt302spsmrannlwds.html revised: June 24, 2016. Contact webmaster.