Cold Pressed Evening Primrose Carrier Oil Scientific Name: Oenothera Biennis Other Names: Evening Star Oil, Sun Drop, Color and Smell: It is golden yellow and has a slightly nutty scent Texture: Evening Primrose Oil has a thick consistency that is absorbed into the skin very slowly Shelf Life: 1 year Evening Primrose, sometimes known as Evening Star is a Biennial plant common to North America and other temperate counties. The plant is named Evening Primrose as the flowers open fully at night and close up again through the morning of the next day. Evening Primrose Oil is said to have many properties. Among them are a number of positive effects to the skin such as helping with dandruff, eczema and psoriasis.