Family: Poaceae

Agrostis nebulosa (cloud grass), is an annual grass native to southwestern Europe, including Portugal and Spain. It is particularly valued in gardens and floral arrangements for its delicate and airy appearance. With its ability to quickly reach maturity and self-seed, it has become naturalized in several locations in North America and may do so if cultivated in the Hawaiian Islands, although it is unclear what negative impacts it may have within its introduced range.

High Risk Traits:

• Naturalized in the continental U.S. (no evidence in the Hawaiian Islands to date)
  
• Reported to be a weed (impacts unspecified)
  
• Other Agrostis species are invasive weeds
  
• Tolerates many soil types
  
• Reproduces by self-seeding
  
• Reaches maturity in one growing season (annual)
  
• Seeds dispersed by intentional planting and possibly other means
  
• Gaps in biological and ecological information may reduce accuracy of risk prediction

Low Risk Traits:

• Valued as an ornamental grass, with no explicit negative impacts documented within its introduced and naturalized range
  
• Unarmed (no spines, thorns, or burrs)
  
• Non-toxic
  
• Grows best in high light environments (dense shade may inhibit spread)
  
• Herbicides may provide effective control (based on efficacy on other weedy Agrostis species)