Life Cycle and Food Plants
Eggs are laid singly on the upperside of the food plant leaves. As far is known Common Rock-rose Helianthemum nummularium seems to be the sole food plant in Britain. The larvae hibernate while still quite small and continue to feed and grow the following spring. Like the Brown Argus, it is attractive to ants and often attended by them. Pupation takes place at ground level in late May and butterflies are on the wing from mid June to mid July.
Read more about this topic: Northern Brown Argus
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