This is a common and widespread aspecies in Bulgaria and can be very abundant, appearing in places in such density that they are reminicent of passing through showers of very large snow-flakes! They occur from lowlands to over 1500m, with some individuals straying to higher altitudes.
This species, especialy the females, can sometimes be confused in flight with Clouded Apollo (Parnassius mnemosyne), the latter a very local species occuring mostly in the mountains. Female Black-veined Whites in particular, with the semi-transparent wings and similar size and not disimilar flight, can look very like a worn Clouded Apollo in flight.
It overwinters in a communal larval web on stems of the host plant.
Overwinters as Overwinters as a larva.