Walkers can help conserve the New Forest’s biodiversity during Invasive Species Week 2026 – 22-29 June – by recording non-native species such as rhododendron.

The annual event aims to raise awareness of invasive non-native species and show how everyone can help prevent their spread.

The New Forest’s mix of wetlands, ancient woodlands, heathlands and ponds are threatened by invasive non-native plants like Himalayan balsam, Japanese knotweed and rhododendron.

They threaten habitats by spreading quickly and out-competing native species, reducing food, shelter and breeding opportunities – and ultimately biodiversity.

The Verderers of the New Forest Higher Level Stewardship (HLS) scheme has helped to support work to tackle the issue, including with the New Forest Non-Native Plants Project which is led by Hampshire and Isle of Wight Wildlife Trust, plus a rhododendron control programme run by Forestry England.

Originally introduced in the 18th century for ornamental use and game cover, rhododendron has since become highly invasive, spreading quickly and outcompeting native plants in many parts of the forest.

This “pretty invader” forms dense thickets that block out light, making it difficult for native wildflowers, mosses, and grasses to survive, in turn affecting the insects, birds, and other wildlife that depend on a rich and varied understorey.

If you spot rhododendron while on a walk, take a moment to report its location to help the New Forest Rhododendron Recording project.