Downy Brome is mostly considered a winter annual although it can also be a spring annual or biennial. Its finely divided fibrous root uses moisture from the upper layers of the soil thereby making it difficult for other species to establish. Its root has the ability to grow throughout the winter so when temperatures warm, the plant has a head start on other species. Downy Brome reproduces by seed and is a prolific seed producer. It matures early in the growing season.
Weeds are a formidable force with which to reckon.
Whatever method man employs to eradicate the weeds, the weeds are able to adapt and maintain their position. The war between weeds and man is unlikely to ever end and so far, the weeds have the advantage.