Strawberry
Summer Annual Weed Seedlings
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Use the photos below to identify weeds in the field. Names link to more on identification and biology.
 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 (Conyza canadensis): Sunflower family; summer annual; seed leaves dull green, oval with fine hairs, and with short stalks that sometimes may be tinged brown-purple; first true leaves covered with hairs on upper surface and margins; undersides of early leaves smooth. |
 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. |
 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. |
 Sweetclover (Melilotus sp.): Pea family; biennial, sometimes annual or short-lived perennial; seed leaves oblong, smooth; first true leaf oval, narrow at base and squared at tip with a minute nipplelike point; subsequent leaves compound with three leaflets, each resembling the first true leaf. |
 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. |
 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. |
 Russian thistle (Salsola tragus): Goosefoot family; summer annual; cotyledons and first true leaves long and thin; first leaves are fleshy, soft, and weakly spine-tipped; stems slender and flexible, often with reddish purple striations along their length. |
 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. |
 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. |
 Puncturevine (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. |
 Spotted spurge (Euphorbia maculata(=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. |
 Barnyardgrass (Echinochloa crus-galli) Grass family; summer annual; first leaf dull gray green; stem flattened, purplish; no ligule. |