100 HEIRLOOM Common Evening Primrose Seeds Common Evening Primrose is a native biennial flower that produces brilliant yellow flowers atop tall erect stems. It appears as a rosette , flowering in late spring . Common Evening Primrose has bright yellow to gold fragrant flowers that are partially to fully closed during the day and open in the evening. It prefers full sun and sandy soils with medium moisture, although it will grow in most soil types. These brilliant flowers attract birds and insects. The bloom period is June through October