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Palmer amaranth (Amaranthus palmeri) is an extremely competitive invasive annual weed that is highly adaptive. One plant can produce up to 500,000 seeds that may remain viable in soils for 5 years. Under ideal conditions, amaranth can set seed as early as 4 weeks after germination. Petioles on older leaves are as long as or longer than leaf blades; this differentiates it from other amaranth species. Some plants have distinct patterns on leaves. 

Palmer amaranth (Wallace, University of Georgia, amaranth.

(Photo: Rebekah D. Wallace, University of Georgia,

Palmer amaranth (Ackley, Ohio State University, amaranth.

(Photo: Bruce Ackley, The Ohio State University,



  • Cultivate when plants are small.
  • Apply a combination of pre- and post-emergent herbicides.
  • Use contact herbicides before plants reach 4 inches in height.


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