Most Unwanted: Rhododendron
Rhododendron ponticum
Habitat: Terrestrial
Threat: Threatens native ecosystems and species
Status: Established
Rhododendron ponticum is an invasive shrub that is much loved by gardeners however, this species represents a significant threat to both forestry and protected habitats in Ireland.
What is it?
This species was first introduced to parks, gardens, and demesnes in Britain and Ireland in the 1700’s. Rhododendron ponticum is readily recognised by its distinctive attractive flowers and large dark green coloured, oval leaves. It can grow quite tall with specimens regularly attaining 8 m.
Impact
Rhododendron can from very dense thickets and out-compete native plants for space and resources, especially for sunlight. Other impacts on fish and invertebrate communities have been recorded. Rhododendron can also prevent access to sites by the shear mass of plant material blocking paths and right of way.
Where is it from?
The species is native to both Europe and Asia. It is believed that the current populations of Rhododendron in Ireland have been introduced from material taken from both the Iberian Peninsula populations and the Asian populations of this species. Rhododendron has a complex history.
Where are they in Ireland?
Planted in gardens, parks and demesnes.
How did it get here?
Natural dispersal by seed and vegetative means and planted by people.
How are they spreading in Ireland
This species is widespread across Ireland and can be locally abundant, especially in demesne woodlands, and naturalising elsewhere.
What you can do
Report all sightings.
Do not plant Rhododendron or take cuttings from the wild or from Gardens.
Download Best Practice Guidance Document for control of this species
Additional reading
Habitas Invasive Alien Species in Northern Ireland
