Evening primrose is a great edition to a pollinator garden because it blooms at night and attract the nighttime pollinators. Every summer evening at dusk, you can watch each pale yellow flower slowly unfurl. Plants are biennial and bloom in the second year. They can grow up to 6 feet tall with many flower stalks. If you cut back finished flower stalks, they may keep on blooming or live another year. Leaves and flowers are edible, and the seed is pressed into oil that is used for women's hormone regulation. Although it may die after its second year, if you let some flowers go to seed, you will likely see it growing in your garden elsewhere next year.