Family: Lecythidaceae

Origin, Description & Uses
Pachylecythis zabucajo (commonly known as paradise nut or castaña) is a tropical tree native to northern South America, especially the Amazon basin regions of Brazil, Venezuela, and surrounding countries. It is a large rainforest canopy tree known for its impressive, woody, pot-shaped fruit capsules that develop high in the branches and eventually release large, edible seeds. These seeds are rich in oils and nutrients and have traditionally been harvested as a food source in its native range. The tree is also valued for its striking appearance and ecological role in tropical forest systems, providing habitat and food for wildlife.

Risks & Threats
This species is considered low risk in Hawaiʻi and is not known to be invasive or naturalized in the islands. It has not shown tendencies to spread aggressively or disrupt native ecosystems. Any potential concerns are minimal and mainly relate to general horticultural considerations, such as the size of the tree and the heavy fruit, which could pose a minor hazard if planted in high-traffic areas. Overall, Pachylecythis zabucajo is viewed as a well-behaved ornamental and food-producing tree with no significant ecological threats in Hawaiʻi.

High Risk Traits:

• Native to tropical regions
  
• Produces viable seed

Low Risk Traits:

• Narrow climate tolerance
  
• No naturalization or invasiveness recorded
  
• No spines, thorns, or burrs
  
• Non-toxic and non-allergenic
  
• No vegetative reproduction
  
• Slow to mature (10–12 years to flower/fruit)
  
• Limited dispersal (water, mammals only)
  
• Low seed production