Isotoma 'Avant-garde Blue'

RHS Plant Profile
rock isotome 'Avant-garde Blue'

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rock isotome 'Avant-garde Blue' RHS / Joanna Kossak
rock isotome 'Avant-garde Blue' RHS / Joanna Kossak
rock isotome 'Avant-garde Blue' RHS

Synonyms

Laurentia 'Avant-garde Blue'

Bedding

A compact, well-branched, bushy perennial to about 30cm, with deeply cut foliage. Blue, star-shaped flowers are produced over a long period from late spring into autumn

Position

Full sun

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 or Well–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)
H3

Colour & Scent

Season Stem Flower Foliage Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family
Campanulaceae
Native to GB/Ireland
No
Foliage
Evergreen
Habit
Bushy
Genus
Isotoma can be annuals or perennials, with pinnately lobed leaves and long-tubed, salver-shaped flowers
Name Status
Accepted

How to Grow

Cultivation

Any well-drained soil in full sun is suitable

Propagation

Propagate by seed or softwood cuttings

Suggested planting locations and garden types

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

Pruning

Deadhead and trim as required

Pests

Generally pest-free

Diseases

Generally disease-free