Host plants:
The larvae feed polyphagously on low-growing plants.
Habitat:
Euxoa cos inhabits dry and hot habitats of all kinds from sea level up to the mountains. Especially suitable are rocky slopes.
Life cycle:
The young larva hibernates. I found it still young in a rocky embankment in 1800m on Mount Parnassus near Delphi in early May 2016. The moths fly between August (more rarely already in July) and October.
Remarks:
Euxoa cos occurs from N-Africa across S-Europe (northward to Switzerland and South Tyrol) to Central Asia.