Network Rail has introduced an innovative solution in Perth, Scotland, to tackle the problem of removing invasive non-native species such as giant hogweed and Himalayan balsam.

In a boost for biodiversity, and to mark World Environment Day, a flock of 25 Scottish sheep is an ecologically-friendly solution for the control of the invasive plant species, which will improve the environment without the need to use herbicides.

The site where the sheep graze is on a flood plain and is particularly vulnerable to invasive plants such as giant hogweed and Himalayan balsam.

Sheep enjoy feeding on these, and by clearing them, other plants such as wildflowers, native plants, and pollinators will thrive.

An added benefit of using sheep is that it provides an alternative solution to chemical treatments, which is both sustainable and results in a more balanced ecosystem.

The sheep are kept in a secure grazing area, which Network Rail staff and a professional shepherd from D&W Agri visit daily to check on their welfare and manage the site, which is also monitored by CCTV.

James Morrison, head of sustainability and social value at Network Rail, commented that it is a fantastic example of how working with nature can deliver real environmental benefits, with the sheep helping to manage invasive species sustainably, protect a unique historic site, and create a space for the benefit of both wildlife and the local community.

In Kent, Network Rail has used goats to manage a rare landscape at Folkestone Warren between Folkestone and Dover, and has used artificial intelligence (AI) on the East Coast Main Line to automate the detection of potential hazards such as overhanging trees, leaves, and subsidence that could cause disruption to services.

“This is a really simple way of looking after the space and tackling invasive plants without using chemicals. The sheep are doing a great job helping native plants and wildlife recover. It’s also about making the space safer and easier for people to enjoy, especially local school children, who’ll be able to get much more out of it in future.”

Mark Allan, track maintenance engineer, at Network Rail