Adult Orange-tip butterflies may now have died away for this year but not before completing their life’s purpose, mating and egg-laying to ensure the continuation of their species. (The egg shown below was photographed on Garlic mustard on 15 May.)

Orange-tips overwinter as pupae, not something I’ve ever seen but, if you look now at the plants their larvae munch on, you’ll probably spot caterpillars of various sizes.

Their favourite larval plants are Cuckooflower (Cardamine pratensis) and Garlic mustard (Alliaria petiolata) but they will also use other crucifers: Hedge mustard, Winter-cress, Turnip, Charlock, Large bitter-cress and Hairy rock-cress, according to Peter Eeles in Life Cycles of British & Irish Butterflies.

Looking at the excellent photos in Peter’s book, I think the larvae shown in my photos are all late instars; the larvae go through five different stages before they pupate. Eeles writes that the pose shown in the photo above is characteristic of a 5th instar larva.

I’ve made myself a note to look for a pupa near the many Garlic mustard plants on which I found these larvae, though I’m not very hopeful of finding any, as Eeles notes that the larvae often travel quite a distance to find a suitable plant; they don’t use the larval plants as these die back during the winter months.