Range Expansion of Rhododendron ponticum in Scottish Highlands
iNaturalist Community
Invasive Species
Same invasive rhododendron overtaking Scottish hillsides is widely sold in garden centers, and escaped garden plants are now destroying the wild heather landscapes that define Highland ecology.
A tough, invasive shrub called rhododendron — originally from around the Black Sea — is marching steadily into Scottish mountain valleys, spreading more than two kilometers every year. It forms dense thickets that crowd out heather, the purple-flowering plant that covers and defines Scotland's upland landscapes. Warmer winters are the main culprit: cold used to stop rhododendron from surviving at high elevations, but that natural brake is weakening.
Key Findings
Rhododendron ponticum is expanding at 2.1 km per year into previously uncolonized highland valleys.
Dense rhododendron thickets are displacing native heather (Calluna vulgaris) heathland communities.
The shrub is now surviving winter at 850m elevation, indicating that thermal barriers limiting its spread are eroding due to warming winters.
chevron_right Technical Summary
Invasive rhododendron is spreading rapidly across the Scottish Highlands, advancing over 2 km per year into native heathland as warming winters allow it to survive at higher elevations than ever before.
Abstract Preview
Citizen science data shows R. ponticum advancing 2.1 km/year into previously uncolonized highland valleys. Dense thickets are displacing native Calluna vulgaris heathland. Winter survival at 850m e...
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Rhododendron, from Ancient Greek ῥόδον (rhódon), meaning "rose", and δένδρον (déndron), meaning "tree", is a very large genus of about 1,024 species of woody plants in the heath family (Ericaceae). They can be either evergreen or deciduous. Most species are native to eastern Asia and the Himalaya...