Polemonium yezoense var. hidakanum Bressingham Purple ('Polbress')

RHS Plant Profile
Hokkaido Jacob's ladder [Bressingham Purple]

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Hokkaido Jacob's ladder [Bressingham Purple] RHS

Synonyms

Polemonium yezoense var. hidakanum 'Polbress'

Herbaceous Perennial
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A herbaceous perennial with foliage that is purple-tinged in spring and autumn. It bears clusters of sky blue flowers, marked in a darker blue with a small white centre. These are cupped in shape and are held in clusters from late spring to midsummer

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 West–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
Polemoniaceae
Native to GB/Ireland
No
Foliage
Deciduous
Habit
Columnar upright
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
Trade

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

  • Cottage and informal garden
  • Flower borders and beds

Pruning

Deadhead flowered stems so as to prevent self-seeding

Pests

Generally pest-free

Diseases

Generally disease-free, but may be susceptible to powdery mildews