This species has a wingspan of 36-44 mm. The forewings are pale brown with darker patches around the margin, usually with especially prominent markings at the base and tornus. The hindwings are greyish with darker venation. Melanic forms occur fairly frequently. This moth flies at night from May to July and is attracted to light and sugar and especially to nectar-rich flowers.
The larva feeds on various grasses including Dactylis, Deschampsia, Festuca and Phalaris. This species overwinters as a larva and feeds in mild weather throughout the season.