They are moderately slowly permeable in about the upper 2 feet and very slowly permeable below. Some flood hazard exists from tributary water that flow across areas of these soils to the main stream. Usually these are manmade ditches. Most areas of these soils are used for cultivated crops. Soybeans, wheat, and corn are the principal crops.
Yields are highly variable from year to year.
Native vegetation was swampgrasses. Principally in the backswamp areas in the Missouri River bottoms in Iowa and probably adjoining states. Holly Spring soils are of small extent. Woodbury County, Iowa, 1975.