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Nymphaea Pygmaea Helvola - Water Lily

Nymphaea Pygmea Helvola
Water Lily

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More information

Discovered in France (1929), Nymphaea "Colonel A.J. Welch" is a very vigorous, hardy water lily suitable for medium to large, deep ponds (to 1.50m (5ft)). Between June and September, its cup-shaped flowers open and then spread out like a star (up to 15cm (6in) in diameter with approximately 23 petals), they are superb, light yellow with golden yellow stamens. Its dark green many leaves are marked with brownish-purple when young. 
Flower size
5 cm
Height at maturity
20 cm
Spread at maturity
1.50 m
Exposure
Sun
Hardiness
Hardy down to -18°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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Description

The French hybrid (1929) Nymphaea Colonel A.J Welch is a hardy, very vigorous water lily suitable for medium to large, deep ponds (up to 1.5m (5ft)). Between June and September, its flowers open in a cup shape and then bloom into a star shape (up to 15cm (6in) in diameter with approximately 23 petals). They are light yellow harmonizing with the golden yellow stamens. Its many dark green leaves are marbled with bronze and marked with brownish-purple when young.

Nymphea 'Colonel A.J. Welch' is a deciduous aquatic perennial with rhizomes belonging to the Nymphaeaceae family. It is a hardy hybrid obtained through cross-breeding various European and North American species, including Nymphaea alba, Nymphaea odorata, and Nymphaea mexicana. It develops large floating, deeply heart-shaped, entire, wavy-edged or toothed leaves, some of which stand erect. The plant will reach 20cm (8in) high, flowering fairly well from June until autumn and spreading at least 150cm (59in). The large, perfectly shaped, very double flowers 18cm (7in) in diameter are solitary, floating, open during the day and closed at night. They are a very bright pale yellow with golden yellow stamens. The flowers are followed by fruits containing numerous seeds. The fruit ripens underwater and releases floating seeds, which will eventually sink and germinate in the mud.

 

Choose easy, well-flowered varieties, the right size for your pond. Water Lilies will be the main attraction of your pond with their spectacular flowers. Most of them bloom from spring until early autumn. Water lilies are essential for maintaining the balance of a garden pond as they contribute to water oxygenation and their leaves will provide shade and shelter for your fish, which in turn protect the lilies from predatory insects such as aphids.

 

The genus name comes from the Greek "nymphaia" and the Latin "nymphaea", which mean "water lily". They were inspired by the nymphs of Greek and Latin mythology. Some Nymphaeas produce flowers that open in the day, some at night, and occasionally they are fragrant.

Flowering

Flower colour yellow
Flowering time June to September
Inflorescence Solitary
Flower size 5 cm

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

Pygmea Helvola

Family

Nymphaeaceae

Other common names

Water Lily

Botanical synonyms

Nymphaea Pygmy Yellow, Pygmea Helvola, Pygmy Yellow, Yellow Pygmy, Helvola, pygmaea subsp. helvola, tetragona subsp. helvola, × helvola

Origin

Cultivar or hybrid

Product reference21634

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Planting and care

Hardy water lilies can withstand winter if the depth of the pond is at least 50 cm (20in). Nymphaea 'Colonel A.J Welch' should be planted from March to June at a depth of 40 to 150 cm (16 to 59in). Plant the rootstocks of hardy water lilies in a good, stone-free garden soil (never use potting soil, as it is too rich and promotes algae growth). Give them the sunniest spot in your pond. Space at least 1.50 m (5ft) apart and plant them by pushing them down into the soil up to the collar. In a natural water feature (pond or lake), make sure the water level remains fairly stable and that the water is neither too acidic nor too chalky (desired pH between 6.5 and 7.5). The rootstocks 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 40 cm (16in) wide (wider than it is tall). If the bottom is muddy, simply attach a stone to the rootstock and throw the whole thing in at the desired location. Never leave Nymphaea rootstocks exposed to the sun or air; plant them as soon as you receive or purchase them. If you have fish in your pond, spread a thick layer of large gravel on the surface of the potted plant to discourage them from digging in the soil and dirtying the water. Water lilies will grow best 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 (for example: Osmocote 10-11-18-2 with a duration of 5-6 months). During the summer, remove excessive leaves from the centre of the clump and keep only the strongest ones. Also remove any yellowed or stained leaves, as well as roots 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 -18°C (USDA zone 7a) Show map
Ease of cultivation Amateur
Planting density 2 per m2
Exposure Sun
Soil pH Neutral
Soil type Clayey (heavy), Silty-loamy (rich and light)
Soil moisture Damp soil, flooded, muddy

Care

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

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