Family: Ericaceae

Origin, Description & Uses
Erica lusitanica, commonly known as Spanish heath, is a shrubby evergreen plant native to France, Portugal, and Spain. It is valued for its delicate, needle-like foliage and profuse clusters of small, bell-shaped white to pale pink flowers that bloom over an extended period. Spanish heath is often used as an ornamental plant in gardens and landscapes for its aesthetic appeal and ability to tolerate poor soils, drought, and coastal conditions. Its hardiness and low maintenance requirements have contributed to its popularity in cultivation.

Risks & Threats
In Hawaiʻi, Spanish heath is naturalized on Maui and possesses traits that raise concern. It produces abundant seeds, can spread beyond cultivation, and has the potential to form dense stands that outcompete native vegetation. These characteristics may allow it to alter plant communities and negatively impact tropical island ecosystems. Because it is already established and shows invasive tendencies, it could continue to spread and become more problematic over time. For these reasons, it is considered a high-risk species, and planting is not recommended. Instead, choosing a low-risk or native alternative will help protect Hawaiʻi’s unique ecosystems.

High Risk Traits:

• Naturalized: Widespread outside native range (Australia, NZ, UK, Maui).
  
• Weed Status: Weed of roadsides, pastures, forestry, and natural areas.
  
• Environmental Impact: Forms dense stands, dominates understorey, displaces native vegetation.
  
• Congeneric Weed: Other Erica species are also invasive.
  
• Unpalatable: Foliage avoided by livestock.
  
• Fire Hazard: Dense thickets increase fire risk; resprouts vigorously after fire.
  
• Shade Tolerance: Seedlings tolerate shade, aiding establishment.
  
• Thicket-Forming: Creates dense, monospecific populations.
  
• Seed Production: Prolific seed output (millions per plant).
  
• Vegetative Spread: Root suckering and resprouting from lignotuber.
  
• Multiple Dispersal Methods: Wind, water, vehicles, machinery, soil movement.
  
• Persistent Seed Bank: Seeds viable in soil for 4+ years.

Low Risk Traits:

• Climate Suitability: Limited to Mediterranean/temperate zones; not tropical lowlands.
  
• No Physical Defenses: Lacks spines or thorns.
  
• Non-Toxic: No evidence of toxicity to animals or humans.
  
• No Animal Dispersal: Seeds not adapted for bird or external animal dispersal.
  
• Controllable: Responds well to herbicides and hand-pulling of small plants.