Family: Geraniaceae

Origin, Description & Uses
Pelargonium citronellum (citronella pelargonium, lemon-scent pelargonium) is a fragrant shrub native to the southwestern Cape Province of South Africa. This attractive ornamental plant is known for its deeply lobed green leaves and clusters of soft pink to lavender flowers. When the foliage is brushed or crushed, it releases a strong lemon-like scent, making it popular in gardens, patios, and containers. It is commonly grown for its aromatic qualities, ornamental appeal, and use in scented gardens and herbal plantings.

Risks & Threats
Pelargonium citronellum is considered a low risk species for Hawaii. It is not known to spread aggressively or invade natural ecosystems, and there is little evidence that it poses significant ecological threats in tropical island environments. While it may occasionally persist in cultivated areas, it generally lacks the invasive traits associated with high-risk ornamental plants. With proper garden management and responsible planting practices, this species can be enjoyed as a decorative and fragrant addition to landscapes without substantial environmental concern.

High Risk Traits:

• Other Pelargonium species are invasive
  
• Tolerates shade
  
• Tolerates many soil types
  
• Hybridizes with other Pelargonium species
  
• Reproduces by seeds
  
• Seeds dispersed by wind, and intentionally by people
  
• Limited ecological information reduces accuracy of risk prediction

Low Risk Traits:

• No reports of invasiveness or naturalization
  
• Unarmed (no spines, thorns, or burrs)
  
• Non-toxic
  
• Not reported to spread vegetatively