Family: Apocynaceae

Origin, Description & Uses
Pachypodium baronii is a succulent shrub native to northern Madagascar, where it grows in dry, rocky habitats. It is well known for its thick, swollen, water-storing stem (caudex) and its paired sharp spines, adaptations that help it survive in arid conditions. The plant produces narrow green leaves and striking bright red to pink trumpet-shaped flowers, making it highly valued as an ornamental species. It is commonly grown in succulent collections, botanical gardens, and dry, water-efficient landscape designs for its dramatic appearance and architectural form.

Risks & Threats
This species is considered low risk and is not known to be invasive or weedy in Hawaiʻi or similar tropical island environments. It has slow growth, limited natural spread, and generally requires specific dry, well-drained conditions that reduce its ability to establish outside cultivation. There are no significant ecological impacts or documented cases of it forming wild populations. While its spines can pose minor handling concerns, it does not present meaningful environmental threats when responsibly cultivated.

High Risk Traits:

• Grows in tropical climates
  
• Spiny
  
• Toxic
  
• Seeds likely dispersed by wind and people
  
• Able to regenerate after cutting

Low Risk Traits:

• No reports of invasiveness or naturalization, but limited evidence of widespread introduction outside native range
  
• Landscaping and ornamental value
  
• Specialized pollinator requirements (likely limits seed set outside native range)
  
• Not reported to spread vegetatively