The caterpillar feeds on Rumex species (Rumex acetosa and related species).
Lycaena candens inhabits forest meadows, glades, alpine meadows with mountain streams and sunny slopes from 900m to 2400m above sea level.
The young caterpillar overwinters and is mature in May or early June. The moths fly from late June to early or mid-August.
Lycaena candens is very similar to Lycaena hippothoe and can be separated only through the genitals. The distribution areas are exclusive, however: Lycaena candens is found only on the southern Balkan Peninsula from southern Serbia across Albania, Macedonia and Bulgaria to Central Greece.