Family: Asteraceae
High Risk Traits:
- Elevation range exceeds 3000 m, demonstrating environmental versatility
- Able to grow in temperate and tropical climates
- Naturalized on Hawaii, Maui, Lanai, and Molokai and widely naturalized elsewhere
- A weed of disturbed sites, and possible weed of agriculture
- Other Picris species have become invasive
- Unpalatable to grazing animals
- Host of olive pathogen
- Tolerates many soil types
- Reproduces by seeds
- Seeds dispersed by wind, water, animals (externally) and as a seed contaminant
- Prolific seed production
- Some seeds may persist in the soil for up to 5 years
Low Risk Traits:
- Unarmed (no spines, thorns, or burrs)
- Requires full sun
- Self-incompatible
- Not reported to spread vegetatively
- Herbicides may provide effective control
- Mechanical methods provide effective control