Family: Brassicaceae

Matthiola incana (Brompton stock, common stock, gilly flower) is an herbaceous perennial species in the Brassicaceae family. It is native to coastal areas of southern and western Europe. Matthiola incana is a common garden flower, available in a variety of colors, many of which are heavily scented and used in floristry. It is reported to be naturalized in Australia, New Zealand, Turkey, Africa, Europe, North America, and South America, but has not naturalized on any Hawaiian Islands to date. It poses some risk of naturalization as it reproduces by wind-dispersed seeds, is self-fertile, and may reach maturity in one growing season.

High Risk Traits:

• Widely cultivated and naturalized (but not in the Hawaiian Islands to date)
  
• Described as a garden escape, and sometimes as a weed, but negative impacts are unspecified
  
• In Australia, regarded as an environmental weed of rarely significant impacts on natural systems
  
• Other species in the genus are invasive weeds
  
• Potentially allelopathic
  
• Unpalatable and resistant to deer (and probably other browsing animals)
  
• Tolerates many soil types
  
• Reproduces by wind-dispersed seeds
  
• Self-fertile
  
• May reach maturity in one growing season (annual life cycle in some environments)
  
• Seeds dispersed by wind, through intentional cultivation, and potentially through accidental movement

Low Risk Traits:

• Where cultivated, generally regarded as a desirable plant with minimal to negligible impacts
  
• Unarmed (no spines, thorns, or burrs)
  
• Non-toxic
  
• Grows best in high light environments (dense shade may inhibit spread)