While some varieties are considered invasive weeds, rat grass is resilient, tolerating poor soil, drought, and full sun. It germinates quickly in warm temperatures and can form dense patches, sometimes outcompeting desirable plants. For gardeners, management involves hand-pulling young plants and improving soil drainage to prevent overspread. Though often unwanted, it provides cover for small invertebrates and supports early ecosystem succession, balancing its role as a garden pest with ecological value for US and European landscapes.