Rhododendron Dell

Another of Kew's famed single plantings is the rhododendrons - one of the largest and showiest groups of flowering shrubs, with great variation in size, habit and form. There are over 700 specimens planted in the Dell, with some unique hybrids found only here. This is not a natural valley, but a creation of 'Capability' Brown, who carved what he called the 'Hollow Walk' out of the Thames flood plain in 1773.

The oldest specimen is Rhododendron campanulatum; the most highly scented are Rhododendron kewense 'King George' and Rhododendron loderi. Flowering continues from November to August, with most at their best in late May.

The brilliant mass of white flowers each spring comes from the largest planting, 'Cunningham's White', which thrives in the local conditions, shaded by trees and kept humid by the Thames nearby.

In recent times several factors have affected the collection. These include the loss of shade-providing elms in the late 1970s, due to Dutch Elm Disease; the storms of 1987 and 1990, attack by Armillaria fungus, and prolonged periods of drought. Kew's response has been to plant new trees, creating more shade; treat the area with high-acidity mulch; and to add soil conditioners which helps the rhododendrons to thrive.

The original planting is being augmented with the planting of more rhododendron hybrids and species, as well as other plants to extend the period of interest. This has helped recreate much of the splendour of the original Rhododendron Dell, making it one of the most popular areas with visitors.

Find out more

Kew Gardens in Spring

Continue the tour

Back up to: Western Zone

Carry on to: Azalea Garden

See also

Kew's History & Heritage: Rhododendron Dell