Update on Elm Tree Avenue Project

A White-letter Hairstreak butterfly success story!

The population of White-letter Hairstreak butterflies in Northwich Woodlands was threatened by the loss of mature elms to Dutch Elm Disease.

An avenue of 20 Ulmus ‘New Horizon’ trees had been planted in November 2019 as part of FoAM’s 20th Anniversary celebrations. This species had been selected because it is resistant to Dutch Elm Disease and had been demonstrated to provide suitable habitat for White-letter Hairstreak buttterflies in Vauxhall Spring Gardens, London.

When these disease-resistant trees were planted in 2019, it was hoped that they would become established and attract White-letter Hairstreak butterflies.

By May 2024, the newly planted trees alongside Marbury Lane were coming along nicely.

Ulmus ‘New Horizon’ trees in 2024

Early in 2025, Chris Reiki found a White-letter Hairstreak pupa on one of the new trees and in June 2025, Rupert Adams found evidence of significant larval activity on several of the new trees. He also saw several male butterflies displaying for territory above the new trees.

White-letter Hairstreak butterfly

Chris Reiki photographed this White-letter Hairstreak butterfly on one of the new elm trees.

In September 2025, The Northwich Guardian carried an article celebrating the successful outcome of the project.