Family: Rutaceae

Origin, Description & Uses
Murraya paniculata (mock orange) is native to tropical and subtropical regions of Asia extending to Vanuatu. It is a highly valued ornamental evergreen shrub or small tree that has been widely planted in Hawai‘i since the 1800s, especially in gardens, hedges, and landscaped settings. It is commonly used as a dense hedge, windbreak, street tree, and container plant, and is also popular for small spaces such as townhouse or condominium gardens. The plant is well known for its glossy green foliage and highly fragrant white flowers that may bloom several times a year, often in synchronized bursts across neighborhoods. In Hawai‘i, its foliage is sometimes used as a substitute for maile, and its flowers are occasionally incorporated into haku or wili-style leis. Birds also consume its red fruits, helping to spread seeds.

Risks & Threats
Mock orange is naturalized on Kaua‘i, O‘ahu, and Maui, indicating that it is already persisting outside of cultivation in Hawai‘i’s landscapes. While it remains widely planted and appreciated, it does possess traits that are cause for concern, particularly its ability to produce bird-dispersed seeds that could allow it to spread beyond intended garden settings. This raises the potential for it to become more invasive in suitable habitats over time, especially in disturbed areas. Although it is not currently considered a major ecological threat, caution is recommended to ensure that it does not negatively impact Hawai‘i’s native ecosystems. Careful management and monitoring of its spread are encouraged, and planting of lower-risk native or non-invasive alternatives should be considered where appropriate.

High Risk Traits:

• Naturalized beyond native range (e.g., Kaua'i, O'ahu, Maui, Puerto Rico, Florida)
  
• Environmental weed in Florida (Category 2 invader)
  
• Host for citrus psyllid (vector of citrus greening disease) and Mediterranean fruit flies
  
• Tolerates wide range of soils (clay, sand, loam; acidic to alkaline)
  
• Shade tolerant
  
• Produces viable seed
  
• Bird-dispersed seeds
  
• Seeds survive gut passage
  
• Vigorous coppicing after disturbance

Low Risk Traits:

• No spines, thorns, burrs, or climbing habit
  
• No allelopathic or parasitic traits
  
• Non-toxic to animals and humans
  
• No fire hazard
  
• No vegetative fragmentation
  
• No wind, water, or external animal dispersal
  
• Low seed output (1–2 seeds per fruit)