Isotoma axillaris 'Blue Star'

RHS Plant Profile

blue star creeper 'Blue Star'

RHS 1999

Synonyms

Laurentia 'Blue Star'

Annual Biennial Conservatory Greenhouse

A bushy perennial to 30cm, with coarsely toothed or lobed leaves and star-shaped, sky blue flowers 4cm across, from late spring to 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: 1–2 years
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
Potentially harmful: Skin irritant. Wear gloves and other protective equipment when handling
Genus: Isotoma can be annuals or perennials, with pinnately lobed leaves and long-tubed, salver-shaped flowers
Name Status: Unresolved

How to Grow

Cultivation

Grow as summer bedding or container plant either on patio or under glass. Any well-drained soil in full sun is suitable

Propagation

Propagate by seed or softwood cuttings

Suggested planting locations and garden types

City and courtyard gardens
Patio and container plants
Flower borders and beds

Pruning

Deadhead and trim as required

Pests

Generally pest-free

Diseases

Generally disease-free