Geranium psilostemon 'Jason Bloom'

RHS Plant Profile
Armenian cranesbill 'Jason Bloom'

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Armenian cranesbill 'Jason Bloom' RHS
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Herbaceous Perennial
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'Jason Bloom' is an upright clump-forming herbaceous perennial, up to 1.2m high, with deciduous, seven-lobed, mid-green leaves, and large, shallowly bowl-shaped flowers, 5-6cm across, of deep magenta-pink petals with black centres and veins, from early to late summer

Position

Full sun, Partial shade

Soil Types

Chalk, Clay, Loam, Sand

Max Height

1-1.5 metres

Max Spread

0.5-1 metres

Size

Time to Maturity
2–5 years
Max Spread
0.5-1 metres
Max Height
1-1.5 metres

Growing Conditions

Chalk Clay Loam Sand
Moisture
Moist but well–drained
pH
Acid or Alkaline or Neutral

Position

Full sun Partial shade
Aspect
North–facing or 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)
H7

Colour & Scent

Season Stem Flower Foliage Fruit
Spring
Summer
Autumn
Winter

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 sun or partial 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
  • Patio and container plants
  • Wildlife gardens
  • Coastal
  • Wildflower meadow
  • Flower borders and beds
  • Underplanting of roses and shrubs

Pruning

No pruning required, but cutting back flowered stems and old leaves may encourage the growth of fresh leaves and flowers

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