is one of the butterfly species that can be seen early in the spring. That is because it hibernates as a fully developed butterfly like a number of other early butterflies, such as Aglais urticae and Gonepteryx rhamni, the butterflies you see early in the spring hatched already last autumn.
The larvae of Inachis io and Aglais urticae feed only on nettles. If you want to enjoy their splendour, you should save a patch of nettles in a sunny spot close by.