Geranium (Cinereum Group) 'Thumbling Hearts'

RHS Plant Profile

cranesbill [Thumping Heart]

Synonyms

Geranium (Cinereum Group) Thumping Heart

Herbaceous Perennial

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A herbaceous perennial with a compact, clump-forming habit. It has small, deeply lobed, mid-green leaves and in late spring and summer, produces upward facing, cup-shaped, lilac flowers with dark veins and purple centres.

Position

Full sun, Partial shade

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 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): H5

Colour & Scent

Season	Stem	Flower	Foliage	Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family: Geraniaceae
Native to GB/Ireland: No
Foliage: Semi evergreen
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 moderately fertile well-drained soil in sun or partial shade.

Propagation

Propagate by division in spring and by basal softwood cuttings in early to mid spring using bottom heat.

Suggested planting locations and garden types

Gravel garden
Cottage and informal garden
Low Maintenance
Ground cover

Pruning

Cut back flowered stems to the base after flowering is finished. In autumn to late winter cut back withered stems.

Pests

Maybe susceptible to vine weevil where grown in containers.

Diseases

Maybe susceptible to powdery mildew in hot dry weather