Rosebay Rhododendron, Great laurel

Rhododendron maximum

Physical Characteristics

Rhododendron maximum is an evergreen Shrub growing to 3.5 m (11ft 6in). See above for USDA hardiness. It is hardy to UK zone 3. It is in leaf all year, in flower from June to July, and the seeds ripen in October. The species is hermaphrodite (has both male and female organs) and is pollinated by Bees. Suitable for: light (sandy) and medium (loamy) soils and prefers well-drained soil. Suitable pH: mildly acid soils and can grow in very acid soils. It can grow in semi-shade (light woodland). It prefers moist soil.

Distribution

Eastern N. America - Nova Scotia and south to Georgia and Alabama.

Habitats

Woodland Garden Dappled Shade; Shady Edge;

Edible Uses

None known

Medicinal Uses

Analgesic Antirheumatic Cardiac The poulticed leaves are used to relieve arthritic pain, headaches etc[61, 222]. A decoction of the leaves is occasionally employed internally in domestic practice in the treatment of rheumatism[82, 257]. The leaves are taken internally in controlled dosage for the treatment of heart ailments[222]. Caution is advised, see the notes above on toxicity.

Known Hazards

The leaves are poisonous[222]. Ingestion can cause convulsions and coma[222]. The pollen of many if not all species of rhododendrons is also probably toxic, being said to cause intoxication when eaten in large quantities[183].