Family: Proteaceae

Origin, Description & Uses:
Grevillea rosmarinifolia, commonly known as rosemary grevillea, is a flowering shrub native to southeastern Australia. It typically grows 1–3 meters tall and features narrow, needle-like leaves reminiscent of rosemary, with clusters of vibrant red to pink flowers that attract birds and pollinators. This species is popular in gardens and landscaping for its ornamental value, drought tolerance, and ability to provide nectar for wildlife. It is often used as a hedge, screening plant, or decorative shrub in temperate climates.

Risks & Threats:
Although Grevillea rosmarinifolia is not currently known to be naturalized in the Hawaiian Islands, it does possess traits that are cause for concern. Its fast growth, prolific flowering, and adaptability to a range of soils could allow it to establish and spread outside cultivated areas if introduced. Further evaluation is needed to determine whether this species could negatively impact native Hawaiian ecosystems. Caution is recommended when planting or distributing this shrub to prevent potential ecological impacts.

High Risk Traits:

• Naturalized beyond native range (California, Victoria, ACT)
  
• Garden/amenity weed in multiple Australian regions
  
• Congeneric weed (G. robusta invasive elsewhere)
  
• Creates fire hazard (highly flammable)
  
• Tolerates wide range of soil conditions
  
• Produces viable seed
  
• Hybridizes naturally
  
• Dispersed intentionally by people (popular ornamental)
  
• Dispersed by ants (external animal dispersal)
  
• Tolerates hard pruning and fire

Low Risk Traits:

• Not suited to tropical climates (temperate only)
  
• No spines, thorns, or burrs
  
• Non-toxic to animals or humans
  
• No vegetative fragmentation
  
• No bird dispersal (not fleshy-fruited)
  
• Low seed production (only small portion flowers set seed)