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Nymphaea Denver

Nymphaea Denver
Water Lily, Waterlily

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A medium to large-sized water lily that produces 10-12 cm flowers, well double, in ivory white colour, shaded with pink at the base, slightly fragrant. The plant develops beautiful closed oval leaves, with overlapping lobes, in a fairly light green colour, with slight reddish-brown spots that fade over the season. This elegant variety is suitable for medium to large-sized ponds, as well as containers. Its rootstock should be planted at a depth of 40 to 80 cm (up to 1 m). Plus, this water lily can tolerate partial shade.
Flower size
10 cm
Height at maturity
20 cm
Spread at maturity
1.50 m
Exposure
Sun, Partial shade
Hardiness
Hardy down to -23°C
Soil moisture
Damp soil
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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 'Denver' is one of the few varieties of ivory water lilies. It is a hardy hybrid prized for its elegant double pastel flowers, versatility, and improved shade tolerance. The leaves of this water lily are ovate, fairly light green, adorned with reddish-brown spots that fade over the season. This variety is suitable for ponds of all sizes, with its rhizomes ideally planted at a depth of 40 to 80 cm and 80 cm.

The hybrid water lily 'Denver' is a horticultural creation by Robert Kirk Strawn (USA) dating back to 1996. It is a aquatic perennial with deciduous foliage that belongs to the Nymphaeaceae family. This plant develops numerous floating leaves measuring 10 to 12 cm in diameter on a mature plant starting from spring. The leaves are ovate and their sinus is often closed, with their two lobes overlapping. When young, they are heavily maculate with reddish-brown and gradually turn green while retaining brownish spots. The plant, of medium vigour, spreads on average to 1.20 m. Flowering begins in June and continues until September. The double flowers, cup-shaped, with 48 petals, slightly fragrant, measure between 8 and 12 cm in diameter. Their very soft colour is ivory white with a touch of yellow and a very light pink blush at the base. They open on the water's surface or at the top of short peduncles slightly above the surface. These corollas open during the day and close in the evening. Each flower lives for 4 to 5 days before withering, it returns underwater and is replaced by another flower. The flowering is followed by the formation of fruits containing numerous seeds. The fruit ripens underwater and releases floating seeds that will eventually sink and germinate in the mud. Water lilies are hardy as long as their rhizome does not freeze in winter. It is important to ensure that the water does not freeze at the depth where they are installed.

Choose varieties of water lilies that are easy, hardy, and floriferous, and above all, those that have a size proportionate to your pond. With their perfectly shaped flowers, water lilies are among the most beautiful pond plants. Most of them bloom for many weeks, until early autumn. The water lily is an essential aquatic plant for the proper balance of a garden pond, as it contributes to the oxygenation of the water. Its floating leaves on the water's surface will provide shade and shelter for your fish, which in turn will protect them from predatory insects such as aphids.

The genus name comes from the Greek nymphaia and the Latin name nymphaea, which means "water lily". They were inspired by the nymphs of Greek and Latin mythology. Nymphaea bears flowers that are sometimes diurnal, sometimes nocturnal, and occasionally fragrant.

Flowering

Flower colour white
Flowering time June to September
Inflorescence Solitary
Flower size 10 cm
Fragrance slightly scented

Foliage

Foliage persistence Deciduous
Foliage colour variegated

Plant habit

Height at maturity 20 cm
Spread at maturity 1.50 m
Growth rate normal
Suckering/invasive plant

Botanical data

Genus

Nymphaea

Cultivar

Denver

Family

Nymphaeaceae

Other common names

Water Lily, Waterlily

Origin

Cultivar or hybrid

Product reference21234

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Planting and care

The rhizome of the 'Denver' water lily should be planted from March to June at a depth of 40 to 80 cm (up to 1 m). Plant the rhizomes of hardy water lilies in good garden soil, rich in clay or silt and free of stones (never use potting soil, it is too rich and promotes the development of algae). Give them the sunniest spot in the water feature. Space each rhizome at least 1 m apart and plant them by inserting them vertically into the soil up to the collar. In the case of a natural water feature (pond or lake), make sure that the water level remains fairly stable and that the water is neither too acidic nor too alkaline (desired pH between 6.5 and 7.5).

The rhizomes can be planted in a wicker basket or a fine mesh basket that is sunk in the desired location. For classic hardy water lilies, use a pot with a diameter of 40 cm (wider than it is tall). If the bottom is muddy, simply attach a stone to the rhizome and throw the whole thing to the desired location. Never leave the Nymphaea rhizomes exposed to the sun or air to prevent them from drying out; plant them as soon as you receive or purchase them.

If you have fish in your pond, it is preferable to spread a thick layer of large gravel on the surface of the planted pot to deter them from digging into the soil and thus fouling the water. The development of water lilies will be optimal if they are planted in containers suitable for their growth.

Water lilies are hungry plants: distribute a balanced slow-release fertiliser at planting, and then every year at the beginning of the growing season. During the summer, remove excessive leaves that grow in the centre of the clump and keep only the most vigorous ones. Also remove yellowed or stained leaves as well as aquatic weeds that emerge from the surface.

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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 -23°C (USDA zone 6a) Show map
Ease of cultivation Amateur
Planting density 1 per m2
Exposure Sun, Partial shade
Soil pH Neutral
Soil type Clayey (heavy), Silty-loamy (rich and light)
Soil moisture Damp soil, flooded, muddy, submerged in water

Care

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

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