Lobelia erinus Cascade Improved Mixed

RHS Plant Profile
trailing lobelia [Cascade Improved Mixed]

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Annual Biennial Bedding

A trailing, tender perennial grown as an annual, with fine, spreading stems, tiny leaves and masses of small white, pale blue, dark blue and purple flowers from late spring until autumn

Position

Full sun, Partial shade

Soil Types

Chalk, Clay, Loam, Sand

Max Height

0.1-0.5 metres

Max Spread

0.1-0.5 metres

Size

Time to Maturity
1 year
Max Spread
0.1-0.5 metres
Max Height
0.1-0.5 metres

Growing Conditions

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

Position

Full sun Partial shade
Aspect
East–facing or South–facing or West–facing
Exposure
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. For best results apply a balanced fertiliser every two weeks during spring and early summer and a nitrogen-free fertiliser every two weeks from mid-summer onwards

Propagation

Propagate by seed sown at 13-18ºC in late winter

Suggested planting locations and garden types

  • City and courtyard gardens
  • Cottage and informal garden
  • Hanging Basket
  • Rock garden
  • Patio and container plants
  • Bedding

Pruning

No pruning required

Pests

May be susceptible to slugs and snails

Diseases

Generally disease-free