The flowers of Evening Primrose Oenothera biennis close in the daytime when sunlight would heat them, and open later when dusk falls.
This plant is food for several butterfly and moth species larvae.
The seed pods that form along the stem are an interesting shape and structure, especially when dried.
Oenothera species are 'roadside' plants -- they grow well in disturbed soil like along railways, roads, and waste areas.
