Family: Hippocastanaceae
High Risk Traits:
- Toxic to animals (including bees) and humans.
- Allelopathic, inhibits other plant growth.
- Host for pests and pathogens.
- Increases fire hazard due to early leaf litter.
- Tolerates a wide range of soil conditions.
- Dispersed intentionally by humans.
- Resprouts vigorously after damage or fire.
- History of introduction outside native range.
- Congeneric species are known weeds.
Low Risk Traits:
- Climate Specific: Requires a Mediterranean climate (not tropical/subtropical).
- Not Naturalized: No evidence of establishment outside native range.
- Not a Weed: No weedy history in agriculture or ecology.
- Sun-Dependent: Cannot establish in shaded, closed-canopy forests.
- Poor Reproduction:
- Low seed production (~100/tree/year).
- No seed bank (seeds die within a year).
- No vegetative reproduction.
- Limited Dispersal: Large seeds dispersed only by gravity, water, or caching animals; not by wind, birds, or as a contaminant.
- Controllable with herbicides.
