Iowa appears to be the northern extension of its range. It is most common in pastures. Tumble pigweed is found in all counties of Iowa. Tumble pigweed is a small plant, about three feet high at maturity. Its flowers are found in small, inconspicuous clusters throughout the plant attached between the leaves and stems.
Tumble pigweed is common across the entire United States.
In Iowa it seems to be confined mainly to construction areas and is not currently an important field weed. Prostrate pigweed is found in all counties of Iowa. Like tumble pigweed, its flowers are found in small, inconspicuous clusters throughout the plant attached between the leaves and stems. Although prostrate pigweed is common in the state, it seems to be confined to sidewalk cracks and waste ground. It is not a major agricultural weed.