Family: Polygonaceae

Origin, Description & Uses
Triplaris weigeltiana is a fast-growing tree native to tropical regions of South America. It is valued as an ornamental for its upright form, large leaves, and showy, papery pink to reddish flower clusters that can persist on the tree for extended periods. Like other species in the genus, it is often planted as a landscape specimen in warm climates and is well adapted to tropical conditions. In Hawaiʻi, Triplaris weigeltiana has become naturalized on Oʻahu, meaning it has established self-sustaining populations outside of cultivation.

Risks & Threats
Although attractive, Triplaris weigeltiana possesses traits that are cause for concern in Hawaiʻi. It is naturalized and has the potential to spread beyond planting sites by producing abundant wind-dispersed seeds that can establish in disturbed areas and natural habitats. As a fast-growing tree, it may compete with native vegetation, alter plant communities, and contribute to the degradation of tropical island ecosystems. Because of these risks, planting this species is not recommended where low-risk or native alternatives are available. Since it is already naturalized in Hawaiʻi, its use should be carefully managed, and new plantings should be avoided, especially near natural areas or in locations where it is not yet widely established, to help minimize further spread and ecological impacts.

High Risk Traits:

• Naturalized outside native range (Australia, O'ahu)
  
• Environmental weed (French Polynesia, Australia)
  
• Congeneric (T. americana) is a regulated weed
  
• Forms dense thickets
  
• Reproduces by viable seed
  
• Intentionally dispersed by people (ornamental planting, seed trade
  
• Wind-dispersed seeds
  
• Tolerates disturbed habitats

Low Risk Traits:

• Narrow climate tolerance (frost-free tropics only)
  
• No spines, toxicity, or parasitic habit
  
• No prolific seed production or persistent seed bank
  
• Dispersed only by wind (not by water, animals, or gut passage)