Rumex species such as Rumex acetosa and R. acetosella
Lycaena ottomana inhabits grassland fragments in sparse forests, shrub-rich grasslands on forest edges and similar sites. I met Lycaena ottomana feeding on mint on the Greek Olympus in 900m asl in a nutrient-poor meadow with wet spots. Here also occurred Pyrgus armoricanus.
The caterpillar overwinters. The adults fly in two generations (AprilMay and July/August). On Mount Olympus, I watched Lycaena ottomana in late July 2010, 2011 and 2012.
Lycaena ottomana is limited in distribution to the southern Balkans (from S-Serbia) and to Turkey.