OENOTHERA, Evening primrose, Sundrops There are many biennial and perennial Oenotheras but several are rather popular annuals. Oenothera drummondi. Drummond Evening-primrose. This annual, 1 to 9. feet tall, has bright yellow flowers. Like all Evening primroses it is four-petaled. Oenothera America is a large-flowered type with white flowers, which turn pinkish. USE. They are attractive border plants for sunny locations, […]