Evening primrose is an ornamental herb that blooms at dusk, and both planting and care are very simple

Evening primrose is a herbaceous plant in the genus Oenothera of the family Onagraceae, also often written as daixiao grass, with the aliases evening primrose and fragrant evening primrose. It is native to South America and gets its name because its flowers open at dusk, making it a fairly representative ornamental flower for night gardens.

The plant height is mostly between half a meter and one meter, and the leaves are lanceolate. The flowers are mostly bright yellow when they first open, release a distinct fresh fragrance after blooming in the evening, and gradually close and wither the next morning; the flowering period is mostly concentrated in summer and autumn. This habit of closing by day and opening by night is exactly the origin of its name.

Evening primrose is robust by nature, likes sunny environments with good drainage, has good drought tolerance, and is not demanding about soil. Propagation is mainly by sowing, and either spring sowing or autumn sowing works; after seedlings emerge, thin them appropriately, and just keep the soil slightly moist during the growing period, as routine management is relatively extensive.

In garden applications, evening primrose is suitable for arranging flower beds, flower border edges, or slope greening, and when planted in patches the night landscape is especially striking. Its flowers can also attract night-active insects such as moths to come and pollinate, which is somewhat helpful for enriching the nighttime ecology of a courtyard.

It should be noted that evening primrose and Oenothera biennis have similar names and are often confused in everyday usage; the two are mostly closely related plants in the same genus. The seeds of Oenothera biennis in the same genus can be pressed for oil used in processing, while evening primrose is mainly valued for ornament. When grown at home, if light is insufficient, the plant tends to grow leggy and produce fewer flowers; placing it in a sunny spot can noticeably improve this.