Common along roadsides, waste areas, misused pastures, rangelands, and cultivated crop areas. Open slopes, salt desert shrub, sagebrush, pinyon juniper, and less commonly in aspen and conifer communities. 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.