Discover the show-stopping Nymphaea 'Arc-en-ciel'
By: Sam Crosfield - 14/01/2011
Find out about the show-stopping, psychedelic and truly unique waterlily, Nymphaea 'Arc-en-ciel', which is grown in the aquatic zone of the Tropical Nursery and displayed to the public in the Princess of Wales Conservatory.
Nymphaea ‘Arc-en-ciel’ is an unusual day-blooming waterlily. Its multi-coloured leaves range from mid-green, to pink and dark red, often looking like it has been ‘tie-dyed’. Several waterlilies have blotches, but this is the only one that is variegated in this distinct way.
The colourful, marble- patterned foliage of Nymphaea 'Arc-en-ciel' (Image: Perry Slocum)
'Nymphaea' is Greek for water nymph and 'Arc-en-ciel' is French for rainbow (literally 'Arc in the sky'). This waterlily has broadly ovate to rounded floating leaves which can reach 25 cm in length and 12 cm across. It has a distinct cleft at the base of each leaf. Nymphaea ‘Arc-en-ciel’ produces white to pale pink star-shaped flowers, with yellow stamens. This unscented, hardy cultivar is considered to be relatively slow growing; an excellent plant choice for a small, sheltered pond or even for an indoor pool.
History of Nymphaea 'Arc-en-ciel'
Nymphaea 'Arc-en-ciel' (Image: Kit Knotts)
Little is known about this cultivar (particularly in terms of its parentage). Indeed, it was thought to have disappeared from cultivation. That changed when waterlily enthusiast Philip Swindells came across one that had no label while visiting Denver Botanic Gardens. He correctly identified it as Nymphaea ‘Arc-en-ciel’ as he had seen it a decade earlier in Europe before it disappeared.
Nymphaea ‘Arc-en-ciel’ has added significance as this waterlily, like many others, is inextricably linked with Joseph Bory Latour-Marliac (1830–1911). Marliac was one of the first to hybridise waterlilies, opening his French nursery in 1875. He introduced many new colours and forms. Sadly, Marliac’s ‘secrets’ of hybridising died with him, but he developed about 70 first-class Nymphaea hybrids, many of which are still popular, such as Nymphaea ‘Marliacea Rosea’, N. ‘Marliacea Chromatella’ and N. ‘Marliacea Carnea’.
In 1889, Marliac presented his collection to the World Fair of Paris; the same year that the Eiffel Tower was completed. Installed in the water gardens in front of Le Trocadéro, his hybrid waterlilies caused a sensation and won first prize in their category. They also caught the eye of impressionist painter Claude Monet. The exhibition inspired him to create the water garden in Giverny, as well as around 250 of his trademark oil paintings.
Cultivating Nymphaea 'Arc-en-ciel'
Waterlily tanks in the aquatic zone of the Tropical Nursery (Image: RBG Kew)
N. ‘Arc-en-ciel’ has been growing in the aquatic zone in the Tropical Nursery in tanks that are heated to 21˚C. Above the tanks are supplementary lights which not only increase the light levels in the zone but can also extend the day length. The temperature of the zone ranges from a minimum of 18˚C to a maximum of 22˚C. The evaporation from the tanks keeps the humidity in the zones quite high. The waterlilies are potted into loam. Crocks are used at the base of the pot and then topped with grit, which prevents the loam from escaping when submerged into the water. This cultivar is propagated by dividing the plant.
N. ‘Arc-en-ciel’ has been on display to the public in the small pond on the west side of the Princess of Wales Conservatory.
- Sam -
About the Tropical Nursery
The main functions of the Nursery are to:
- Form a back-up collection of tender tropical plants used to support science, display and education within the gardens. We supply plants for use in displays in the Main Kew conservatries, for festivals and events organised by the Foundation and the Directorate.
- Supply plants for education purposes to the Schools & Families department.
- Act as main propagation facility for the Princess of Wales Conservatory, Palm House and Temperate House as well as supporting the exchange of plants between Kew and other institutions and collections.
- Provide direct education in nursery techniques and the cultivation of tropical plants for the Kew Diploma course, Apprentice and Trainee programme, Internship and work experience programmes and visiting staff from other UK and overseas institutions.
- Support conservation by working with the UKOTs team undertaking propagation and cultivation protocols on targeted endangered species.
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