Found primarily in the 15-56 cm precipitation zones' although is found in many climatic areas. Sandy or gravely soils, does not grow well on heavy soils, or soils with high salts. Reproduction Annual or winter annual, reproduces by seeds. Plants are self-fertile. Seed is often a contaminant in hay, grain, and straw and is difficult to separate from crop seed.
Germination is increased by moistening of stratum.
Litter also promotes germination and establishment of seedlings. Seeds will germinate regardless of whether they are in contact with soil. However, germination is enhanced when in contact with soil. Seeds germinate best in dark or diffuse light. Adequate fall or spring moisture seems to be primary factor which inhibits germination.