Oenothera elata subsp. hookeri, commonly known as Hooker’s Evening Primrose, is a perennial herb native to various habitats across Western North America, including riparian zones, wet meadows, and damp open areas. It typically grows at a moderate rate to heights of 2-6 feet (0.6-1.8 meters) and spreads 1-2 feet (0.3-0.6 meters). This species is characterized by its tall, erect stems and lance-shaped leaves. The large, yellow, showy flowers have a delicate fragrance and bloom in the summer, opening in the evening and closing by the next noon, hence the name "evening primrose." The flowers are particularly attractive to nocturnal pollinators such as moths.

Hooker’s Evening Primrose is valued for its striking yellow flowers and its ability to attract wildlife, making it a popular choice for native plant gardens, pollinator gardens, and restoration projects. It is also used for erosion control due to its robust root system. This plant prefers full sun to part shade and thrives in medium to slow-draining soils, including clay, loam, or sandy types, with high moisture levels. While generally easy to maintain, it can be susceptible to root rot if overwatered or planted in poorly draining soils. It is not known to be invasive when grown outside its native range, but gardeners should monitor its spread as it can self-seed prolifically under ideal conditions.CC BY-SA 4.0