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Nymphaea White Sultan - Waterlily

Nymphaea White Sultan
Water Lily, Waterlily

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This giant water lily produces huge white cup-shaped flowers with a yellow centre from June to September or even October. These flowers float on the water's surface with their large, round, tender green leaves. This Nymphaea is suitable for medium to large ponds. Plant it in the sun under 30 to 80 cm of water. It is an aquatic plant that withstands cold weather as long as the water at the planting depth does not freeze.
Flower size
15 cm
Height at maturity
20 cm
Spread at maturity
1.50 m
Exposure
Sun
Hardiness
Hardy down to -20°C
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Best planting time March to April
Recommended planting time March to June
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Flowering time June to September
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Description

The Nymphaea 'White Sultan' is a water lily with a large growth habit well-suited for medium to large ponds. For weeks on end, large pure white flowers with yellow stamens appear at their centre, and a light fragrance appears. Its large, tender green leaves float on the water's surface. This hardy variety can be planted in full sun under 30 to 80 cm of water, directly in the mud, in a basket, or in a container.

The hybrid water lily 'White Sultan' is a horticultural creation by Robert Kirk Strawn (U.S.A) in 1991. Belonging to the Nymphaeaceae family, it is an aquatic perennial with deciduous foliage. Its floating leaves appear in spring. Measuring 15 to 20 cm in diameter, they are round and a beautiful tender green. The plant, particularly vigorous, spreads over 90 cm to 1.50 m. The flowering usually starts in June and continues until September or even October. The slightly fragrant flowers float on the water's surface. In a cup, they measure between 10 and 15 cm in diameter. The corollas are open during the day and close at night. They have between 24 and 26 large and rounded petals of a pure and shiny white, revealing a golden yellow stamen. Each flower lives for 4 to 5 days before wilting and being replaced by a new one.

With its generous flowering, this giant water lily, 'White Sultan', is stunning in a medium to large pond. It is hardy as long as the water does not freeze to the depth at which the rhizome is planted. It blooms for weeks on end, from late spring to early autumn. It is also an essential aquatic plant for maintaining a balanced pond, as it contributes to water oxygenation. Its floating leaves provide shade and shelter for fish and serve as resting platforms for dragonflies and amphibians. Along the edges of your water feature, opt for white with Iris sibirica 'Not Quite White' with its large white flowers and meadowsweet Filipendula purpurea 'Alba'. Add some verticality to your composition with Typha angustifolia or narrow-leaf cattail.

Flowering

Flower colour white
Flowering time June to September
Inflorescence Solitary
Flower size 15 cm
Fragrance slightly scented

Foliage

Foliage persistence Deciduous
Foliage colour light green

Plant habit

Height at maturity 20 cm
Spread at maturity 1.50 m
Growth rate normal

Botanical data

Genus

Nymphaea

Cultivar

White Sultan

Family

Nymphaeaceae

Other common names

Water Lily, Waterlily

Origin

Cultivar or hybrid

Product reference21273

Planting and care

The Nymphaea 'White Sultan' water lily should be planted with the rootstock a few centimetres deep in the soil, at a depth of 30 to 80 cm of water, or even 1 m. The water lilies are hardy when the water does not freeze at the depth at which they are planted. In shallow ponds, planting in a container is possible. In this case, the rootstocks in damp sand are protected from frost in winter. Plant them in good garden soil, preferably rich, by inserting them vertically until the collar. Avoid using horticultural compost, which is too rich. Planting the rootstocks in a basket about 40 cm wide is also possible. Sink the basket in the desired location and weigh it down if necessary. Plant your rootstocks promptly after receiving them. Choose the sunniest area and leave at least 1 m between each rootstock.


In the case of a natural body of water (pond or lake), ensure that the water level remains relatively stable and that the water is neither too acidic nor too alkaline (pH between 6.5 and 7.5).
If there are fish in your pond, spreading a thick layer of coarse gravel around the base is preferable to deter them from digging up the rootstock.


Water lilies are hungry plants. Every year, at the beginning of the growing season, apply a slow-release fertiliser that will nourish your water lily throughout its growing period (for example, Osmocote 10-11-18-2 with a duration of 5-6 months).


During the summer, remove any leaves that may grow excessively in the centre of the clump, keeping only the most beautiful ones. Remove any yellowed or stained leaves.

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Planting period

Best planting time March to April
Recommended planting time March to June

Intended location

Suitable for Pond
Hardiness Hardy down to -20°C (USDA zone 6b) Show map
Ease of cultivation Amateur
Planting density 1 per m2
Exposure Sun
Soil pH Neutral
Soil type Clayey (heavy), Silty-loamy (rich and light)

Care

Pruning No pruning necessary
Disease resistance Very good
Overwinter Can be left in the ground

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