Weeds, Insects & Diseases

Pigweed, redroot [Amaranthus retroflexus]



Description

Usually up to 5 ft in height, the erect stem has fine short hairs and is freely branched. The leaves are simple, alternate, dull green, with hairs on the veins on the underside. Well developed root system with shallow red roots.


View full description

Propagation, emergence and growth

Annual. Small, dark, red to brown seed. Seedling stems are red to green, smooth and hairless to slightly hairy. First leaves are green and hairy with indented tips and smooth edges.


View more info



Distribution

Widespread, but mostly a problem in the Great Plains.


View distribution info


Recommended solution

  • Target logo

Description

Usually up to 5 ft in height, the erect stem has fine short hairs and is freely branched. The leaves are simple, alternate, dull green, with hairs on the veins on the underside. Well developed root system with shallow red roots.

Propagation

Annual. Small, dark, red to brown seed.

  • Pigweed, redroot

Seedling

Seedling stems are red to green, smooth and hairless to slightly hairy. First leaves are green and hairy with indented tips and smooth edges.

Juvenile Plant Description:

Top leaves are rounded and fine small hairs can be found on the plant.

Mature Plant

Stems erect, usually branched, 2 to 4 feet, sometimes much higher, at maturity. Bottom of branches thick and smooth. Upper branches and stem slightly to very hairy. Stems red to red striped.


Leaves alternate, ovate to lanceolate, smooth edges, dull green above and lighter below. Prominent white veins and slightly hairy underneath, long stalks. Shallow notch at tips of young plants.

  • Pigweed, redroot
Root Structure Description:

Taproot, shallow, red or red striped.

  • Pigweed, redroot

Distribution

Widespread, but mostly a problem in the Great Plains.

Habitat Description:

Cultivated and fallow fields, roadsides and waste areas.

Similar Species

Prostrate pigweed, smooth pigweed, and Powell amaranth. Smooth and redroot pigweed are difficult to distinguish until flowering stage.

Recommended solution

  • Peak® 75WG herbicide is a water dispersible granular herbicide for selective post-emergent control of broadleaf weeds in field corn and winter wheat.                                                          

  • Target logo

    Target® provides excellent performance on tough broadleaf weeds, such as buckwheat, thistles and Group 2-resistant kochia in wheat, barley and oats.