The weeds shown here may be seen in spring-planted corn seedlings. For weeds in fall-planted corn seedlings, see common winter weeds. Names link to more information on identification and biology.
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Barnyardgrass
(Echinochloa crus-galli): Grass family; summer annual;
first leaf dull gray green; stem flattened, purplish; no ligule. |
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. |
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. |
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. |
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. |
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
(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. |
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. |
Junglerice
(Echinochloa colona): Grass family; summer annual; grayish, dull green first leaves; several purple bands on surface of leaf blade; no ligule, no auricle. |
Morningglories
(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. |
Palmer amaranth
(Amaranthus palmeri): Pigweed family; summer annual; cotyledons are long and narrow and often red underneath; true leaves are alternate, oval-shaped, and notched at the tip. |
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. |
