How do you recognise Common rhododendron (Rhododendron ponticum)?

Leaf

Krzysztof Golik, Wikimedia · CC BY-SA 4.0

Common rhododendron

Rhododendron ponticum L.

Also known as: Pontic rhododendron

Family: Ericaceae

2 to 5 m tall, sometimes more

Planted as a specimen or in hedges in parks and gardens, acid soils

Flowering: May – June

Part shade

Shade

Hardy, to about -20°C, needs acidic soil

❓ How do you recognise this plant?

The common rhododendron, widely planted as an ornamental, is also an invasive species in some damp Atlantic forests such as in Brittany, where its dense foliage smothers the natural regeneration of native trees. The alpenrose remains a small mountain shrub with tiny leaves and small pink-red bell-shaped flowers, whereas the common rhododendron is a large invasive shrub with large leathery leaves and large mauve flowers in clusters.

🍃 Leaves

Evergreen, large, leathery, glossy, elongated

🌸 Flowers

Large, mauve to purplish-pink, grouped in dense clusters at the tips of the twigs

🍎 Fruits

Small woody capsule

🪵 Bark

Grey, smooth, becoming rough with age

🗺️ Distribution

Native to the eastern Mediterranean basin and the Caucasus; widely planted in France, naturalised and invasive in some Atlantic forests

🐝 Value for pollinators

Large flowers rich in nectar visited by bees, although the nectar contains toxins (grayanotoxins)

✂️ Horticultural uses

Major ornamental shrub for acid soil, planted for its spectacular flowering; a species to watch as it is invasive in some damp forests

⚠️ Possible toxicity

All parts are toxic if ingested, including the nectar, which can make honey toxic in large quantities (a rare effect, known as mad honey)

⚠️ Look-alike species

Common rhododendron

Rhododendron ponticum

Rusty-leaved alpenrose

Rhododendron ferrugineum

The alpenrose remains a small mountain shrub with tiny leaves and small pink-red bell-shaped flowers, whereas the common rhododendron is a large invasive shrub with large leathery leaves and large mauve flowers in clusters.

🌿 Other Ericaceae to discover

ℹ️ Educational profile — do not use it to judge whether a plant is edible or safe.

🌱 This database is constantly evolving — species and information are added and corrected regularly. Spotted a mistake? Report it below.