Geranium × oxonianum f. thurstonianum 'Southcombe Star'

RHS Plant Profile

Thurston's cranesbill 'Southcombe Star'

Synonyms

Geranium 'Southcombe Star'
Geranium × oxonianum 'Southcombe Star'

Herbaceous Perennial

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A vigorous, clump-forming, spreading, evergreen herbaceous perennial to 55cm tall, with deeply-lobed pale green foliage. Star-shaped carmine-pink flowers with darker veining are often double, and appear from late spring through until the autumn

Position

Full sun, Partial shade

Soil Types

Chalk, Loam, Sand

Max Height

0.1-0.5 metres

Max Spread

0.5-1 metres

Size

Time to Maturity: 2–5 years
Max Spread: 0.5-1 metres
Max Height: 0.1-0.5 metres

Growing Conditions

Chalk Loam Sand

Moisture: Moist but well–drained or Well–drained
pH: Acid or Alkaline or Neutral

Position

Full sun Partial shade

Aspect: East–facing or 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): H7

Colour & Scent

Season	Stem	Flower	Foliage	Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family: Geraniaceae
Native to GB/Ireland: No
Foliage: Evergreen
Habit: Bushy, Clump forming, Spreading branched
Genus: Geranium can be annuals, biennials and perennials, herbaceous or evergreen, with rounded, usually palmately lobed or divided leaves, and lax inflorescences of rounded, 5-petalled flowers
Name Status: Accepted

How to Grow

Cultivation

Grow in moderately fertile, well-drained soil in partial shade. This particular variety will cope with full shade

Propagation

Propagate by division in spring or propagate by basal cuttings in early to mid spring and root with bottom heat

Suggested planting locations and garden types

City and courtyard gardens
Cottage and informal garden
Patio and container plants
Wildlife gardens
Flower borders and beds
Ground cover
Wall side borders

Pruning

No pruning required. Remove flowered stems and old leaves to encourage the production of fresh leaves and flowers

Pests

May be susceptible to vine weevil, capsid bug and geranium sawfly

Diseases

May be susceptible to downy mildew and powdery mildews