Family: Bromeliaceae

Origin, Description & Uses
Tillandsia usneoides (Spanish moss) is an epiphytic bromeliad native to tropical and subtropical regions of the Americas. Despite its common name, it is neither a true moss nor native to Spain. It forms long, silvery-gray, thread-like strands that drape gracefully from tree branches, fences, and other supports, absorbing moisture and nutrients directly from the air rather than from the plants on which it grows. Spanish moss is widely cultivated as an ornamental for its distinctive appearance and is commonly used in hanging displays, floral arrangements, terrariums, craft projects, and landscape design. It also provides shelter and nesting material for some wildlife within its native range.

Risks & Threats
Spanish moss is potentially naturalized on Oʻahu and possesses traits that raise concerns for tropical island ecosystems. It readily reproduces by stem fragments and seed, allowing it to spread to new host trees and other structures. Dense growth can accumulate on branches, potentially shading vegetation, increasing branch weight, and altering habitat conditions. Although it is not parasitic, heavy infestations may stress host plants by reducing light and trapping moisture. Because of its ability to establish outside cultivation, Plant Pono recommends choosing a low-risk or native alternative when suitable options are available. Where Spanish moss is already established, avoid planting it near natural areas and manage existing populations to help minimize further spread and potential impacts on Hawaiʻi’s native ecosystems.

High Risk Traits:

• Broad natural distribution, and elevation range exceeds 1000 m, demonstrating environmental versatility
  
• Thrives in tropical climates
  
• Naturalized on Oahu, Hawaiian Islands and in Australia
  
• Described as a pest in pecan orchards
  
• Other Tillandsia species have become invasive
  
• Flammable and could increase fire risk when densely covering trees
  
• Produces seeds (rarely in cultivation)
  
• Spreads vegetatively by fragments dispersed by wind, birds, water and people
  
• Seeds dispersed by wind
  
• Able to regrow after breaking or damage

Low Risk Traits:

• Generally regarded as a desirable native or ornamental where grown
  
• Unarmed (no spines, thorns or burrs)
  
• Provides fodder for livestock
  
• Non-toxic
  
• Limited seed production in cultivation
  
• Herbicides may provide effective control