Silver-studded blue

Silver-studded Blue butterfly

©Guy Edwardes/2020VISION

Silver-studded Blue butterfly

©Chris Gomersall/2020VISION

Silver-studded Blue butterfly

©Chris Gomersall/2020VISION

Silver-studded blue

Scientific name: Plebejus argus
The dazzling silver-studded blue is a rare butterfly of heathland habitats, mainly in southern England. It has undergone severe population declines in recent years.

Species information


Wingspan: 2.6-3.2cm

Conservation status

Protected in the UK under the Wildlife and Countryside Act, 1981. Priority Species under the UK Post-2010 Biodiversity Framework.

When to see

June to August


The silver-studded blue emerges in June and is usually on the wing until late August. It is a rare butterfly, generally found in heathland habitats that have shorter, sparsely vegetated areas. It is restricted to close-knit colonies in southern England and Wales. Two subspecies can be found in its range, while two others are now extinct in the UK. The larvae feed on a wide variety of plants, such as Bell Heather, Cross-leaved Heath and gorses.

How to identify

The silver-studded blue is a small butterfly which gets its name from the light blue reflective 'studs' (scales) found on the underside of the wings. The upper wings are blue with a dark outer rim. Males are bluer than females, which are more of a dull brown.


Restricted to specific sites in southern England, Wales and Shropshire.

Did you know?

The caterpillars of the silver-studded blue are always found with ants! The ants protect the caterpillars in return for a sugary substance that they produce.

How people can help

The Wildlife Trusts are working to restore and protect our heathlands by promoting good management, clearing encroaching scrub and implementing beneficial grazing regimes. This work is vital if these habitats are to survive; you can help by supporting your local Wildlife Trust and becoming a member or volunteer.