This is a distinctive species, all the wings being white except for a black blotch on the costa of the forewing. The wingspan is 20–24 mm. Often two broods are produced each year and the adults can be seen at any time during the summer and autumn. The species flies at night and is attracted to light and nectar-rich flowers.
The larva is rather variable but is usually green or yellow, often with red markings. It feeds on the flowers of a variety of plants (see list below). The species overwinters as a pupa.