Lobelia erinus Waterfall Blue ('Balobwablu'PBR) (Waterfall Series)

RHS Plant Profile
trailing lobelia [Waterfall Blue]

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trailing lobelia [Waterfall Blue] RHS
trailing lobelia [Waterfall Blue] RHS

Synonyms

Lobelia erinus 'Balobwablu'PBR

Award of Garden Merit
Annual Biennial Bedding

A trailing annual, 10-15cm in height and 20-30cm wide, with small, dark green foliage and flowers 2cm across in summer and autumn. The mid blue-purple flowers have three prominent lower lobes and white throats

Position

Full sun, Partial shade

Soil Types

Loam, Sand

Max Height

0.1-0.5 metres

Max Spread

0.1-0.5 metres

Size

Time to Maturity
1–2 years
Max Spread
0.1-0.5 metres
Max Height
0.1-0.5 metres

Growing Conditions

Loam Sand
Moisture
Moist but well–drained
pH
Acid or Alkaline or Neutral

Position

Full sun Partial shade
Aspect
South–facing or East–facing or North–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)
H2

Colour & Scent

Season Stem Flower Foliage Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family
Campanulaceae
Native to GB/Ireland
No
Foliage
Deciduous
Habit
Trailing
Genus
Lobelia can be annuals, perennials or shrubs, with simple leaves and showy 2-lipped flowers that may be solitary or in racemes or panicles
Name Status
Trade

How to Grow

Cultivation

Grow in deep, fertile, reliably moist soil in full sun or partial shade. Apply a balanced fertilizer every two weeks during spring and early summer and a nitrogen free fertilizer every two weeks from mid-summer onwards

Propagation

Propagate by seed sown at 13-18°C in late winter

Suggested planting locations and garden types

  • City and courtyard gardens
  • Coastal
  • Cottage and informal garden
  • Patio and container plants
  • Flower borders and beds
  • Garden edging

Pruning

Cut back after flowering

Pests

May be susceptible to slugs

Diseases

Generally disease-free