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Herbaceous Perennial

Geranium wlassovianum 'Blue Star'

Wlassov's cranesbill 'Blue Star'

a clump-forming herbaceous perennial, 30-60cm high, with deciduous, seven-lobed, velvety leaves, 5-15cm across, which are dark green flushed with brown and which turn red and orange in autumn, and broadly funnel-shaped flowers, 3cm across, of dark bluish-purple with darker violet-purple veins, from early summer to late summer

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Ultimate height

0.5–1 metres

Time to ultimate height

2–5 years

Ultimate spread

0.5–1 metres

Chalk

Clay

Loam

Sand

Moisture

Moist but well–drained

pH

Acid, Alkaline, Neutral

	Stem	Flower	Foliage	Fruit
Spring
Summer
Autumn
Winter

Full sun
Partial shade

Aspect

North–facing or West–facing or East–facing or South–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)

Botanical details

Family: Geraniaceae
Native to GB / Ireland: No
Foliage: Deciduous
Habit: Clump forming
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 full sun or light shade in moist but well-drained soil

Propagation

Propagate by division in spring

Suggested planting locations and garden types

City and courtyard gardens
Cottage and informal garden
Wildlife gardens
Ground cover
Flower borders and beds
Underplanting of roses and shrubs

Pruning

No pruning required

Pests

Generally pest-free, but may be susceptible to capsid bug, geranium sawfly, vine weevil, slugs and snails

Diseases

Generally disease-free, but may be susceptible to a rust, downy mildews, leafy gall, and virus diseases; may also be susceptible to powdery mildews in dry conditions

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