Papilionaceae as Vicia, Lathyrus, Coronilla and particularly Lotus.
Leptidea sinapis inhabits extensive grasslands, woodland clearings and fringes or sparse pine forests.
The butterflies appear in two, rarely also three generations from April to August/September. Hibernation takes place as a pupa.
Endangerment: regionally endangered or decreasing
In places, Leptidea sinapis is very rare due to a lack of suitable, rather dry fringes like in many regions of the northern Alpine foreland (e.g. Memmingen). Elsewhere, however, it is still common (e.g. Swabian Alb).
Leptidea sinapis is hardly distinguishable from the very similar, recently described Leptidea reali in the field, so that on this site (photos) only the indication Leptidea sinapis agg. can be made.
The distribution extends from Europe across Asia to the Tien Shan.