Bromes are annual grass-weed propagated solely by seeds and, if uncontrolled, weed populations can increase rapidly.
Seeds of all brome species tend to have shorter dormancy, and be less persistent in the soil, than black-grass, rye-grass and wild-oats. Exposure to light inhibits germination of freshly shed seeds of sterile and great brome. Annual seed decline in the soil is about 85 – 90% for bromes as compared with 70 – 80 % for black-grass. Consequently, preventing seed production should enable brome populations to be substantially reduced within two years, but achieving complete control can be a challenge. Soft, meadow and rye brome seeds have slightly greater longevity in the soil than sterile and great brome.