Oenothera flava, commonly known as Yellow Evening Primrose, is a deciduous perennial herb native to open woodlands, grasslands, and desert scrub in the Southwestern USA and Mexico. It typically grows to a height of 0.3-0.4 feet (0.09-0.1 meters) and spreads 1-2 feet (0.3-0.6 meters) wide. The plant forms a low-growing rosette of lance-shaped leaves, and its bright yellow flowers bloom in the spring and are quite showy, opening in the evening and closing by the next midday.

Yellow Evening Primrose is valued for its drought tolerance and the vibrant color it adds to gardens. It is often used in rock gardens, borders, and native plant landscapes. This species thrives in well-drained soils and is adaptable to various soil types, from sandy to loamy. It is also known for attracting pollinators such as bees and moths. While generally low-maintenance, it can be susceptible to root rot if overwatered.CC BY-SA 4.0