Eggs are laid in large batches on the underside of host plant leaves. Young caterpillars feed together in a web, while older ones feed alone and make shelters of folded leaves tied with silk.
Adults hibernate, sometimes in small groups.
One to three broods from March-October. Eurasia from western Europe across Russia to the Pacific Coast. Has strayed twice to New York. G5 - Demonstrably secure globally, though it may be quite rare in parts of its range, especially at the periphery. Opler, P. A. and V. Malikul.