Cotton growth may be compromised by season-long infestation of noxious weeds. Palmer amaranth (Amaranthus palmeri) is the most common weed invading Texas cotton cultures and is also present throughout the Southern U.S.. Therefore, Palmer amaranth was chosen as the model species for this study to examine its competitive effects with cotton. Palmer amaranth control is generally obtained with Preplant incorporated and/or Preemergence herbicide treatments. However, recent herbicide developments have made postemergence control measures possible on an "as needed" basis. Therefore, this study was conducted to determine the competitive effect that Palmer amaranth has on cotton growth and development.