Numbers of Rare Butterfly Eggs are Best on Record After Hedges are Allowed to Grow Wild

Populations of a rare butterfly species have reached unprecedented levels after conservationists allowed hedgerows to grow freely, according to recent findings. The black hairstreak butterfly, one of Britain’s most elusive and threatened species, has seen a remarkable surge in egg numbers, offering hope for its continued survival.

Letting Nature Take the Lead

Conservation groups managing the National Trust’s Bradenham Estate in Buckinghamshire decided to let hedges grow without trimming for several years. This hands-off approach allowed blackthorn, the butterfly’s preferred habitat, to flourish. The dense, uncut hedgerows provided ideal conditions for the black hairstreak to lay eggs and for caterpillars to thrive.

“We’ve seen a dramatic increase in egg numbers compared to previous years,” said a spokesperson for the conservation team. “By simply stepping back and letting the hedges grow, we’ve created a much more suitable environment for this rare butterfly.”

Survey Reveals Record Egg Count

During a recent winter survey, volunteers counted over 1,000 black hairstreak eggs along a single stretch of hedge—more than double the previous record for the site. The eggs, which are tiny and white, are laid on blackthorn twigs and are notoriously difficult to spot.

• More than 1,000 eggs found on one hedge
• Previous record was fewer than 500 eggs
• Eggs are laid in late summer and hatch the following spring

This significant increase suggests that the butterfly population is responding positively to the new management strategy.

Importance of Wild Hedges for Wildlife

Allowing hedgerows to grow wild benefits not only the black hairstreak but also a variety of other wildlife. Thick, mature hedges provide shelter and food for birds, small mammals, and insects. The approach aligns with broader conservation efforts to encourage natural habitats and boost biodiversity.

“We’re seeing more birds nesting and a greater diversity of insects,” the spokesperson added. “It’s a win-win for the entire ecosystem.”

Future Plans and Wider Impact

Encouraged by these results, the conservation team plans to expand the wild hedge strategy to other areas of the estate. They hope their success will inspire other landowners to adopt similar practices, supporting rare species and enhancing local biodiversity.

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