Family: Liliaceae

Origin, Description & Uses
Tricyrtis hirta is a shade-loving perennial wildflower native to central and southern Japan, where it grows naturally in moist woodland environments. It is recognized for its striking, orchid-like flowers that are white to pale lavender with distinctive purple speckling. The plant grows from clumping rhizomes and prefers cool, humus-rich, well-drained soils under partial to deep shade. In horticulture, it is widely cultivated as an ornamental for shaded gardens, woodland plantings, and understory landscapes, valued for its unusual late-season blooms and ability to add visual interest in low-light areas.

Risks & Threats
Hairy toad lily is considered a low-risk species and is not known to be invasive or to pose significant ecological threats in tropical island ecosystems such as Hawaiʻi. It does not exhibit aggressive spread, rapid reproduction, or strong dispersal mechanisms that typically characterize invasive plants. While it may persist and slowly expand under favorable shaded conditions, it has not demonstrated the ability to outcompete native vegetation or alter habitat structure. As with all non-native ornamentals, it should still be monitored in and near natural areas, but overall it is regarded as a low-concern species suitable for responsible cultivation.

High Risk Traits:

• Broad climate suitability (5 hardiness zones)
  
• Naturalized in Massachusetts
  
• Possibly unpalatable
  
• Shade-tolerant
  
• Tolerates many soil types
  
• Reproduces by seed
  
• Self-compatible
  
• May be able to spread vegetatively (contradictory evidence)
  
• Seeds dispersed by wind, possible water and intentionally by people
  
• Limited ecological information reduces accuracy of risk prediction

Low Risk Traits:

• No reports of invasiveness
  
• Unarmed (no spines, thorns, or burrs)
  
• Ornamental