Although the flowers of these shrubs are very pretty, Rhododendron ponticum destroys native wildlife and entire ecosystems. Most native species cannot live alongside this non-native. The dense foliage of rhododendron and the speed at which they grow blocks sunlight, preventing other plants and trees from growing. The leaves and nectar are also poisonous to many insects and other animals. Chemicals in the fallen leaves are even thought to prevent seeds from other species germinating.
These invasive plants are particularly harmful when they take hold in areas of existing high nature value, such as ancient woodlands. They spread rapidly, creating carpets of vegetation which may look stunning in May but are wiping out important habitats. Sadly once established they are very difficult to get rid of as they spread via their tiny seeds and also vegetatively.
The National Park Authority supports various projects which are aiming to eradicate rhododendron from certain areas in the National Park. It requires a dedicated and long term approach. If action is not taken now the issue will become too difficult and too costly to deal with.