A very rare and very local species in Belgium, not often recorded. It inhabits boggy places.

The feeding habits of the larva are poorly known. Like its congeners, it feeds on various grasses. Pupates in a silken cocoon amongst moss.

The adults fly from mid June towards early August, but most observations are from late June and during July. They fly in the afternoon and evening and later come to light.

ID: resembles C. pascuella but differs in having a broader median longitudinal streak which touches costa to half-way from base of wing and a different shape of termen. It looks also much whiter than other Crambus, especially in flight.