Primrose (Oenothera)

Oenothera is a genus of flowering plants in the evening primrose family, Onagraceae. Its species vary in mature size, flower color, flowering season, winter hardiness, and preferred growing conditions, so a genus-level entry cannot give one dependable planting distance or care schedule. This profile covers the genus rather than a single species; use a named species or cultivar record when planning a particular site. ## About the genus Oenothera includes herbaceous plants with different forms and habitats. The [Missouri Department of Conservation’s profile](https://mdc.mo.gov/discover-nature/field-guide/missouri-evening-primrose) of Missouri evening primrose describes one member as low and sprawling, with large yellow flowers in sunny, rocky settings. Those details are specific to that species and should not be assumed for every member of the genus. ## Choosing a species Check the botanical name before comparing mature dimensions, exposure, soil, or winter protection. Species-level guidance is the better source for selecting companions and setting spacing, because the genus includes plants suited to different garden situations. ## Maintenance There is no single watering, pruning, or winter-care schedule for all Oenothera. Follow the guidance for the identified species and local climate, and adjust irrigation to the planting site rather than applying a care routine from one member to the whole genus.