Great brome is a grass species native to the Mediterranean region and Western Asia, thriving in its temperate climes. The plant has since spread to parts of Africa, America, Asia, Europe, and Oceania, establishing itself in a diverse range of environments outside its indigenous habitat.

Great brome originates from the Mediterranean region also commonly identified as the 'Great brome'. Classified as a weed due to its invasive nature, it reproduces at a rapid rate, spreading its seeds out wide, leading to mass propagation. This feature not only leads to significant spread, but it also poses major problems for gardens. Because of its deep root system and rapid growth, it quickly depletes soil nutrients, reducing the availability of these essential elements to surrounding plants. This strain on resources can further lead to overall reduced plant health and diversity in gardens. In terms of spread, great brome primarily spreads via seeds, which can be easily dispersed by wind, water flow, and even by attaching to animals, clothing, or machinery. This widespread dispersal method makes it highly adaptive and difficult to control.

To control great brome, the best season for removal is usually in the late winter or early spring before the plant has started to seed. This means you should aim to remove it when it is still in its vegetative state.