Nuphar japonica

RHS Plant Profile
Japanese pond lily

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Japanese pond lily Dorling Kindersley 2003
Aquatic
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A bottom-rooting aquatic perennial with ovate or heart-shaped, floating leaves and 4-5cm in width, globose yellow flowers, often tinged with red, in summer

Position

Full sun

Soil Types

Clay, Loam, Sand

Max Height

Up to 10 cm

Max Spread

0.5-1 metres

Size

Time to Maturity
5–10 years
Max Spread
0.5-1 metres
Max Height
Up to 10 cm

Growing Conditions

Clay Loam Sand
Moisture
Poorly–drained
pH
Acid

Position

Full sun
Aspect
South–facing or West–facing or East–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)
H6

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
Nuphar are deciduous submerged aquatic perennials with ovate or rounded floating leaves and solitary, globose flowers held just above the water surface
Name Status
Correct

How to Grow

Cultivation

Grow in water up to 2m deep in acid soil providing a free root-run. Divide frequently for optimum flower production. See pond plants for further advice

Propagation

Propagate by division

Suggested planting locations and garden types

  • Low Maintenance

Pruning

Cut back after flowering

Pests

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

Diseases

Generally disease-free