Rhododendron Rampage: The Highland Reclamation

Andy goes forth with a band of merry men and women to tackle this brutish invader

Rhododendron, while adding a splash of beauty to gardens, pose a significant threat when they encroach upon native woodlands, such as those on the West Coast of Highlands. These beautiful invaders are known for their rapid spread, overshadowing and ultimately leading to the loss of indigenous flora. The lush underbrush of birch and rowan trees, adorned with diverse species of mosses, lichens, and fungi, and teeming with insect life, is now often under siege by Rhododendron ponticum (or common Rhododendron)

Rhododendron existed in Great Britain before the last ice age, but they didn't return after the ice receded, allowing the island's current ecological systems to evolve in their absence. However, the Victorian predilection for exotics led to their reintroduction, and they have since thrived. This plant now prolifically occupies vast expanses especially liking the western regions of the British Isles, particularly in regions characterised by acidic soils and shaded environments. It spreads in various habitats including moorlands, uplands, and shaded woodlands.

Near Lochinver, the High Life Highland Countryside Ranger Service have been working to reverse the decline of some ancient woodlands. Long-established native woodlands, adorned with beautiful birch and rowan trees and home to a rich network of mosses, lichens, fungi, as well as countless insect species, face declines as a result of this encroachment by the formidable Rhododendron ponticum. These invasive shrubs can quickly dominate an area, reducing biodiversity and altering habitats.

Among the strategies we're exploring within the High Life Countryside Ranger Service are Stem Injections. Training in this is available from The Woodland Trust and offers a targeted approach to deal with rhododendrons of various ages and growth stages. It aims to maximize the success rate of eradication in one treatment, focusing on identifying and treating layered stems effectively. There are nuances of follow-up routines and complementary control techniques, so weighing up the benefits and drawbacks of stem injection versus other methods (including spraying - which can inadvertently harm the surrounding ecosystem) is really key. Every site and situation requires making careful judgement calls when using chemicals for this purpose, including protecting ourselves from the harmful toxins!

Recognising the urgency of the situation in Sutherland, the High Life Highland Ranger Service has joined forces with passionate individuals from Assynt Field Club to establish the Assynt Conservation Volunteers . Together, we're on a mission to combat the encroaching rhododendrons and protect our precious woodlands.

This week I chose to employ a far less toxic method to eradicate rhododendron, one I first encountered while managing a country park. This method ‘cut stump’ involves cutting down the rhododendron and drilling into the remaining stem to create a reservoir that allows water to accumulate and expedite the rotting process from within, targeting the plant and its root. While the success rates vary, it's an integral part of our multifaceted approach to control and eventually eradicate this invasive species. This method could also include an application of herbicide, but we didn’t do so.

My work in the cold and wind would not have been possible without the dedication of this mighty band of volunteers. Their commitment and hard work are the backbone of our conservation efforts, and for that, I am immensely grateful. Our shared achievements today are a testament to what we can accomplish together.

For those who feel called to protect our natural landscapes from invasive species, we welcome you to join us. Not only will you contribute to a vital cause, but you'll also enjoy the camaraderie of fellow conservationists, and in Assynt this often comes complete with soup and sandwiches.

Our fight against Rhododendron ponticum is another important small step in preserving the biodiversity and beauty of the Highlands for generations to come. If you're inspired to be a part of this meaningful effort, please get in touch. Together, we can make a difference for our local area and our planet.

Read more about how to restore woodlands in the Woodland Trust resources below:

Andy Summers, North Highland's Senior Ranger for High Life Highland, is a dedicated naturalist with a deep understanding of the region's diverse ecosystems. His extensive experience in wildlife conservation and passion for preserving North Highland's pristine landscapes make him a vital asset. Andy's work encompasses wildlife observation, environmental education, and passing on a greater appreciation for the area's unique flora and fauna. His commitment to conserving North Highland's natural heritage is evident in his expertise and unwavering dedication.

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Fancy a walk through a wonderful oak woodland? Let us be your guide!

Embark on a Unique Walk Through Loch a Mhuilinn NNR Oak Woodland by the Sea on

14th March 2024 - 11am-2pm

This walk is led by Donald a naturalist with years of experience in the Ranger service. Under his expert guidance, you'll explore a remarkable oak woodland, uncovering its secrets and viewing the natural world through a new lens. This walk offers serene lochs, meandering rivers, lush mosses, and ferns, framed by breathtaking views. Keep an eye out for playful otters and the many wonders our path uncovers. The journey involves traversing amid dense thickets, off the beaten path, and over undulating terrain. This promises an immersive experience in the heart of nature.