Caterpillars munch on:
Adults take nectar from a range of flowers:
Brimstones are our longest-lived butterflies and can survive for over a year in their adult form. The adults find somewhere dry and sheltered to hibernate, such as under the evergreen leaves of holly and ivy, spending the winter there before emerging in spring.
There is even more about this species on the main Butterfly Conservation website
Males and females fly around each other in a spiral just before mating. They climb high into the air, sometimes until out of sight, before tumbling down and into a bush together.