Tag Archives: Brimstone eggs

B is for Brimstone

07 Tuesday Dec 2021

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Of course, my end-of-year countdown has to include butterflies. Today it’s the Brimstone – there may be others.

211207 brimstone

I was thrilled this year to discover more about the life cycle of this exquisite butterfly. In May, after watching a female laying on the leaves of Buckthorn saplings, I found my first Brimstone eggs and, after that, knowing what Buckthorn looked like, found many more and, of course, lots of lovely caterpillars in various stages of development. I’ve yet to find a chrysalis though – maybe next year.

Brimstone eggs

04 Tuesday May 2021

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This was exciting – or should that be eggs-citing?!

210504 brimstone eggs (1)

I was watching this female Brimstone, first sitting on a patch of brambles, then flying, seemingly haphazardly, through and around bushes along a woodland ride. I thought those bushes were Blackthorn but it turns out they were probably Buckthorn.

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Then I realised the butterfly was egg-laying. In his Life Cycles of British & Irish Butterflies, Peter Eeles describes the process:

Females are particularly choosy about the plants on which they lay their eggs – even on sites with many buckthorns present, only a very small proportion are used by females, who typically lay on plants that are isolated, sheltered and growing in sunny areas, such as at the edge of a woodland ride.

The eggs start off pale green, as shown here, but soon turn yellow and then grey, as the little caterpillar develops. This is the first time I’ve seen Brimstone eggs and I’m fairly sure I’ll be able to find them again so I’m hoping to keep an eye on their progress.