The western lily occurs in bogs composed of damp, slightly acidic and organic soils. This species is generally associated with small shrubs with nearby sunlight, and may use shrubs for mechanical support.
Limiting factors
The western lily has experienced significant habitat loss due to bog draining and filling, land conversion for agriculture, urban development, and road construction. Habitat degradation due to fire suppression has adversely affected this species; encroaching shrubs and trees block sunlight and can change hydrology. Soil compaction, plant collecting and flower picking, and grazing can also be harmful to western lilies.
Data gaps
Conduct studies of reproductive biology. This species may benefit from light grazing, which reduces competition from other plants; determine grazing regimes that maintain populations. Evaluate the effects of foraging by wildlife (e.g., small mammals, deer, elk). Evaluate genetics.
Conservation actions
Continue current conservation efforts, such as grazing management, propagation, and experimental vegetation management (e.g., prescribed fire, mowing). Maintain and restore bog hydrology. Avoid herbicide application during the growing season for roadside populations and use “No Spray” signs for educational purposes.
