Polemonium caeruleum subsp. caeruleum f. album

RHS Plant Profile
Jacob's ladder white form

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Jacob's ladder white form RHS

Other common names

Jacob's ladder

Synonyms

Polemonium caeruleum subsp. amygdalinum 'Album'
Polemonium caeruleum subf. album
Polemonium caeruleum var. lacteum
Polemonium caeruleum subsp. nipponicum f. album
Polemonium caeruleum var. album
Polemonium caeruleum subsp. caeruleum f. albiflorum

Plants for pollinators
Herbaceous Perennial
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A vigorous upright perennial to 75cm tall, with light green, pinnate leaves and pure white flowers with yellow anthers

Position

Full sun, Partial shade

Soil Types

Chalk, Clay, Loam, Sand

Max Height

0.5-1 metres

Max Spread

0.1-0.5 metres

Size

Time to Maturity
2–5 years
Max Spread
0.1-0.5 metres
Max Height
0.5-1 metres

Growing Conditions

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

Position

Full sun Partial shade
Aspect
South–facing or East–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)
H7

Colour & Scent

Season Stem Flower Foliage Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family
Polemoniaceae
Native to GB/Ireland
Yes
Foliage
Deciduous
Habit
Bushy
Genus
Polemonium can be annuals or herbaceous perennials or upright or spreading habit, with pinnate leaves and usually clustered, tubular, bell, or funnel-shaped flowers
Name Status
Correct

How to Grow

Cultivation

Grow in any fertile, moist but well-drained soil preferably in full sun or partial shade

Propagation

Propagate by division in spring

Suggested planting locations and garden types

  • City and courtyard gardens
  • Coastal
  • Cottage and informal garden
  • Wildlife gardens
  • Wildflower meadow
  • Flower borders and beds

Pruning

Cut back to the base in autumn

Pests

Generally pest-free

Diseases

May be susceptible to powdery mildews