Nymphaea 'Colonel A.J. Welch' (H)

RHS

Aquatic

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A cultivar with rounded leaves to 25cm and star-shaped flowers to 15cm across with lemon-yellow outer petals and darker-hued inner petals

Position

Full sun

Soil Types

Clay, Loam

Max Spread

1.5-2.5 metres

Size

Time to Maturity: 2–5 years
Max Spread: 1.5-2.5 metres

Growing Conditions

Clay Loam

Moisture: Poorly–drained
pH: Acid or Alkaline or Neutral

Position

Full sun

Aspect: South–facing or West–facing
Exposure: Exposed or Sheltered
Hardiness

Hardiness Ratings

All ratings refer to the UK growing conditions unless otherwise stated. Minimum temperature ranges (in degrees C) are shown in brackets

H1A: under glass all year (>15C)
H1B: can be grown outside in the summer (10 - 15)
H1C: can be grown outside in the summer (5 - 10)
H2: tolerant of low temperatures, but not surviving being frozen (1 to 5)
H3: hardy in coastal and relatively mild parts of the UK (-5 to 1)
H4: hardy through most of the UK (-10 to -5)
H5: hardy in most places throughout the UK even in severe winters (-15 to -10)
H6: hardy in all of UK and northern Europe (-20 to -15)
H7: hardy in the severest European continental climates (< -20): H5

Colour & Scent

Season	Stem	Flower	Foliage	Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family: Nymphaeaceae
Native to GB/Ireland: No
Foliage: Deciduous
Habit: Submerged, Floating
Genus: Nymphaea are rhizomatous, submerged aquatic perennials with floating, rounded leaves and showy, sometimes fragrant, cup- or bowl-shaped flowers in a wide range of colours, held on or above the water and followed by submerged, berry-like fruits
Name Status: Accepted
Horticultural Group

Horticultural Classification Codes

Horticultural Classification Codes are often given to genera which have a large number of species or cultivars. They are used to categorise cultivated plants based on specific, shared characteristics such as shape, colour, size or flowering time, and can be displayed as letters or numbers

For example:
Dahlia ‘Sunset Kate (Sin) = Single flower
Rosa ‘Marigold’ (HT) = Hybrid Tea: Hardy Nymphaea are aquatic perennials with rounded floating leaves and showy flowers on or just above the water, with numerous narrow petals and conspicuous stamens, in white and shades of yellow, pink and red

How to Grow

Cultivation

Grow in undisturbed water in full sun. Plant in baskets in loamy soil with crowns just below soil surface and covered with pea shingle. Position the basket so it is covered by 15-25cm of water and as the plants establish, lower the basket to twice the initial depth. Feed plants throughout the growing season; see waterlily cultivation for further information

Propagation

Propagate by division of rhizomes or offsets in summer, place pots in shallow water until established

Suggested planting locations and garden types

Wildlife gardens
Low Maintenance

Pruning

Deadhead and remove yellow leaves regularly

Pests

May be susceptible to waterlily beetle, waterlily aphid, brown china-mark moth and leaf-mining midge

Diseases

May be susceptible to crown rot, brown spot and waterlily leaf spot