Naturalist, writer and board gamer. Working at @wildlifebcn.org (views my own). Lead author of Where to Watch Wildlife in Britain By Low-carbon Transport (2026). Owner of a dog/servant to two cats. She/her.
Megan Shersby
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You need to look for unopened flower buds on Elder (in this case on Black Elder/Lace), and you might find the tiny larva of Placochela nigripes which causes the petals to swell and prevents them from opening.