- Description: This species is a perennial gram, growing to 2m tall, and often grow in small clumps. Its leaves are green, and have inflorescence units with 2-5 rames up to 3cm long.
- Origin and Worldwide Distribution: This species has a broad native range in the Americas. It has been introduced elsewhere in the world. It has been introduced to France and Russia Australia, New Zealand, the Republic of Georgia, Japan and South Korea.
- Potential or Known Impacts: This species is an aggressive coloniser of disturbed soils, and invades pastureland. It can outcompete native species by preventing their gemination, and is fire tolerant, leading it to become well-established after fires. it can cause erosion if large areas die off during cooler months.
- How did it/could it get here? It could be introduced via natural means, like dispersal on animal fur and on the wind due to the seeds' outer husk. It has also been introduced accidentally via packing material around alcohol bottles and around NATO ammunition.
- If already present in Ireland where? Not present in Ireland.
- Methods for Prevention: EU-level action includes a ban on sales and any planting or keeping, including in aquaria, as well as rapid eradication of any new populations to avoid the excessively high costs associated with its management later on.
- Current Legislative Position (Listed on 14 August 2019) This species must not intentionally be brought into the Union; kept; bred; transported to, from or within the United Kingdom, unless for the transportation to facilities in the context of eradication; placed on the market; used or exchanged; permitted to reproduce, grown or cultivated; or released into the environment. For further queries, you can contact the Non Native Invasive Species Team in the Northern Ireland Environment Agency on 028 9056 9558.