The evening primroses constitute a genus of about 125 species of delightful plants. They are made up of annuals, biennials and perennials, although many of the perennials are short-lived and are often treated as annuals. The beauty in these plants lies in the flowers, which are cup- or saucer-shaped. The majority are yellow although some are white or pink and a few are orange. Most of the yellow ones fade to a pinkish orange as they age. Many are fragrant, with their scent being particularly noticeable in evening. Some open in the evening (hence the name) while others open in the morning. Individual flowers quickly fade but there is usually a succession over a long season.
They vary considerably in height, from those that grow to no more than a few centimetres above the ground to those growing up to 2m. This provides the gardener with the opportunity of using them in various positions, from rock gardens to mixed and herbaceous borders. Many of the annuals self-sow, making propagation unnecessary. They will grow in any well-drained soil in full sun. They are good for dry areas. Increase from seed.