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The brimstone is common throughout the New Forest and the rest of Hampshire. It is widespread and common in England, less common in Wales and Ireland and mostly absent from Scotland.

Brimstones can be seen in almost any habitat as they wander widely in search of mates and food. They lay their eggs on alder buckthorn trees in the National Park, which prefer damper areas, and they are quite fussy about exactly which tree they choose. They prefer trees in sunny positions, sheltered from the wind.

Being a yellow, or butter-coloured, fly, it is often thought that this species gave rise to the name ‘butterfly’. Unusually, brimstones spend the winter as an adult staying hidden in the shelter of ivy clumps and holly trees.

Brimstones can be seen just about anywhere in the National Park from April through to September, but they are most often seen in woodlands and areas with some trees. If you spend a sunny day in April, May or June in a New Forest woodland you will almost certainly see some brimstones.

ID Tip


Brimstone butterflies are the only yellow butterfly without any black on the wings and so are very easily identified. The female is less bright, more of a creamy colour, but can also be told from any similar species by the lack of black on the wings.

How you can help


Alder buckthorn is never a very common tree and you can help brimstone butterflies by planting one in a sunny, sheltered spot in your garden.

Lead Ranger


'To help ground nesting birds rear their young safely, keep yourself, dogs and ridden horses on the main tracks from the beginning of March to the end of July.'

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