Family: Fabaceae

Canavalia gladiata, commonly known as sword bean or sword jackbean, is a vigorous tropical legume native to parts of Southeast Asia. It is typically grown as a climbing vine rather than a tree, producing long, showy pods that resemble swords—often reaching over a foot in length. The plant has attractive purple to pink flowers and large trifoliate leaves, making it a striking addition to gardens and trellises. Sword bean has a long history of use as a food crop, particularly in Asia, where the immature pods and seeds are cooked after proper preparation. It is also used as a cover crop and green manure, valued for its ability to fix nitrogen and improve soil fertility.

While sword bean is useful and ornamental, its fast growth and high seed production mean it can spread beyond cultivation if not carefully managed. In favorable tropical climates, including Hawai‘i, it has the potential to naturalize along roadsides, disturbed areas, or forest edges, where it may compete with native vegetation. Home gardeners and farmers are encouraged to grow sword bean responsibly by preventing seed escape, removing unwanted plants, and avoiding planting near natural areas. Careful management helps ensure its benefits can be enjoyed without increasing the risk to local ecosystems.

High Risk Traits:

• Elevation range exceeds 1000 m, demonstrating environmental versatility
  
• Thrives in tropical climates
  
• Widely naturalized
  
• Other Canavalia species have become invasive
  
• Seeds are toxic unless cooked
  
• Shade-tolerant
  
• Tolerates many soil types
  
• Climbing and smothering growth habit
  
• N-fixing (may alter soil chemistry)
  
• Reproduces by seeds
  
• Hybridizes with other Canavalia species
  
• Reaches maturity in <1 year
  
• Seeds dispersed by pods which snap open and forcefully eject seeds
  
• Seeds able to be stored for extended periods and likely for form a persistent seed bank

Low Risk Traits:

• Despite naturalization, no confirmed reports of negative impacts were found
  
• Unarmed (no spines, thorns or burrs)
  
• Provides fodder for livestock
  
• Seeds edible if cooked
  
• Self-incompatible
  
• Not reported to spread vegetatively
  
• Relatively large seeds unlikely to be inadvertently dispersed
  
• Pollinator limitations may result in reduced seed set