Appearance
It may grow up to 1.5 m tall and produces clusters of pinkish-red, bell-shaped flowers throughout the summer. The undersides of the leaves are covered in rust-brown spots, which give the species the second part of its binomial name. This is in contrast to "Rhododendron hirsutum", which has no such brown colouring, has hairy edges to the leaves and grows over limestone. Where the two species co-occur, the hybrid "Rhododendron × intermedium" may occur; as its name suggests, it is intermediate in form between the two parental species."Rhododendron ferrugineum" is moderately toxic, containing arbutin, arecoline and rhodoxanthin, and can cause vomiting, and difficulties of the digestive, nervous, respiratory and circulatory systems.
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