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Herbaceous Perennial

Geranium gymnocaulon

A clump-forming perennial, to around 40cm high, with stems covered in short, fine hairs, and green leaves deeply divided into 5-7 toothed lobes. Slender stems bear pairs of violet-coloured flowers with deeply notched petals from late spring to summer

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Plant nurseries
3 suppliers

Ultimate height

0.1–0.5 metres

Time to ultimate height

2–5 years

Ultimate spread

0.1–0.5 metres

Chalk

Loam

Sand

Moisture

Well–drained

pH

Acid, Alkaline, Neutral

	Stem	Flower	Foliage	Fruit
Spring
Summer
Autumn
Winter

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)

Botanical details

Family: Geraniaceae
Native to the UK: 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: Unresolved

How to grow

Cultivation

Thrives in moderately fertile, well-drained soil in sun or partial shade

Propagation

Propagate by seed, by division or by basal softwood cuttings in spring

Suggested planting locations and garden types

Cottage and informal garden
Gravel garden
Patio and container plants
Wildlife gardens
Flower borders and beds

Pruning

Remove flowered stems and old leaves to encourage the production of fresh leaves and flowers

Pests

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

Diseases

May be susceptible to downy mildews and virus diseases, and to powdery mildews in dry conditions

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