Geranium (Cinereum Group) Rothbury Gem ('Gerfos'PBR)

RHS Plant Profile
cranesbill [Rothbury Gem]

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cranesbill [Rothbury Gem] RHS

Synonyms

Geranium (Cinereum Group) 'Gerfos'PBR
Geranium cinereum 'Gerfos'
Geranium cinereum Rothbury Gem

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Alpine Rockery Herbaceous Perennial
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Has low-growing, forming dense cushions of rounded grey-green leaves, to 12cm high, spreading to 30cm. Pink flowers with darker veins and deep red-magenta eyes, to 4cm across, start appearing in late spring, and may rebloom at times all summer

Position

Full sun, Partial shade

Soil Types

Chalk, Loam, Sand

Max Height

0.1-0.5 metres

Max Spread

0.1-0.5 metres

Size

Time to Maturity
2–5 years
Max Spread
0.1-0.5 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
West–facing or South–facing or East–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
Deciduous
Habit
Matforming
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
Trade

How to Grow

Cultivation

Performs best with good drainage and sunlight. Effective ground cover plant

Propagation

Propagate by basal cuttings

Suggested planting locations and garden types

  • Cottage and informal garden
  • Gravel garden
  • Rock garden
  • Garden edging

Pruning

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

Pests

May be susceptble to vine weevil, capsid bug and sawflies

Diseases

May be susceptible to downy mildews and powdery mildews