Family: Arecaceae

Archontophoenix alexandrae (Alexandra palm) is a tall, graceful palm native to Queensland, Australia, where it grows along rainforest streams and moist valleys. It is a popular ornamental species in tropical and subtropical regions due to its smooth gray trunk, feathery fronds, and elegant form. The palm produces bright red fruit that are attractive to birds, which can disperse the seeds into nearby natural areas. In Hawaiʻi, Alexandra palm is widely planted and has become naturalized on Oʻahu, Maui, and Hawaiʻi Island, establishing self-sustaining populations outside of cultivation.

Because of its ability to reproduce and spread in moist environments, Alexandra palm has the potential to invade riparian and wet forest habitats, where dense stands may alter light and moisture availability for native plants. Its tolerance for shade and high rainfall gives it a competitive advantage in Hawaiʻi’s wet regions. While it remains a favored landscaping choice for its aesthetic appeal, care should be taken to prevent its spread into natural areas—especially near streams or forest margins. Planting alternatives that do not pose a risk of invasion are encouraged.

High Risk Traits:

• Naturalized outside native range
  
• Forms dense thickets
  
• High seed production
  
• Self-compatible
  
• Hybridizes naturally
  
• Bird and water dispersed
  
• Shade tolerant
  
• Congeneric species invasive

Low Risk Traits:

• Not agricultural/environmental weed
  
• No toxins or spines
  
• No vegetative reproduction
  
• No seed bank
  
• Not fire-prone
  
• Easily removed physically