Why We Need Caterpillars: Protecting UK Moths in a Changing Climate (2026)

A Call to Action: Saving Our Moth Population

As the vibrant hues of spring paint our gardens, a battle rages between gardeners and the voracious caterpillars feasting on their precious plants. But here's a twist: it's time to rethink our strategy and embrace these caterpillars, for they hold the key to the survival of our beloved moths.

The Moth's Plight: A Crisis Unseen

The Royal Horticultural Society (RHS) and Wildlife Trusts have sounded the alarm, revealing a shocking decline in moth populations across the UK. With over 2,500 species at risk, moth numbers have plummeted by a staggering 33% since the 1960s. Habitat loss, climate breakdown, and pollution are the culprits behind this silent crisis.

Helen Bostock, a senior wildlife expert at the RHS, emphasizes the importance of understanding and supporting these often-overlooked creatures. "Moths deserve our attention and care," she says. "They are not just beautiful in their own right but also play a crucial role in sustaining other garden wildlife, from birds to mammals and larger insects."

Caterpillar Chaos: A Garden's Dilemma

Some caterpillars are notorious for their appetite, devouring everything in sight. Others are more specialized in their dietary preferences. The RHS encourages gardeners to embrace this diversity and appreciate the unique beauty of caterpillars, from the easily spotted large green ones to the masters of camouflage that mimic twigs or bird droppings.

And this is where it gets truly fascinating: these caterpillars transform into stunning moths, each with its own unique charm. From the pink and green elegance of the elephant hawk moth to the deceptive lunar hornet moth disguised as a wasp, and the striking contrast of the Jersey tiger moth, which is becoming more common as our climate warms.

A Plea for Tolerance: Nibbling Allowed

Caterpillars require immense energy to undergo their remarkable transformation. The RHS asks gardeners to adopt a more tolerant approach, allowing for some nibbling on ornamental plants and vegetable crops. After all, a little damage is a small price to pay for the privilege of witnessing these incredible life cycles.

Planting for a Moth-Friendly Garden

The Wildlife Trusts' insect expert, Vicki Hird, suggests creating a haven for caterpillars and, by extension, moths. Planting native trees and shrubs like willow, honeysuckle, foxgloves, and more can provide a diverse food source for a broad range of caterpillars. "Moths are nature's artists," she says. "Their intricate patterns and colors are a joy to behold."

Caterpillar-Friendly Planting Ideas

  • Foxgloves: These charming flowers are a favorite food source for several moth species, including the lesser yellow underwing and angle shades moth.
  • Lady's bedstraw: This native wildflower with delicate yellow blooms attracts the hummingbird hawk-moth and elephant hawk-moth.
  • Mullein: Tall and drought-resistant, these yellow plants are enjoyed by the brightly striped caterpillars of the mullein moth.
  • Mint: A haven for the mint moth and plume moth, and a delight for bees too.
  • Hedges: A mixed native hedge with hawthorn, blackthorn, hazel, and dog rose provides a diverse and abundant food source for caterpillars.

So, are you ready to embrace the caterpillar chaos and contribute to the recovery of our moth populations? It's time to rethink our relationship with these fascinating creatures and create gardens that thrive with biodiversity. Let's spark a conversation and share our thoughts on how we can make a difference. The future of our moths depends on it!

Why We Need Caterpillars: Protecting UK Moths in a Changing Climate (2026)

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