Aquilegia coerulea

RHS Plant Profile
Rocky Mountain columbine

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Rocky Mountain columbine RHS

Other common names

Colorado blue columbine

Synonyms

Aquilegia macrantha
Aquilegia leptocera
Aquilegia helenae hort. ex Bergmans.

Plants for pollinators
Herbaceous Perennial
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An upright perennial with mid-green leaves and deeply lobed leaflets; hairy on their undersides. Flowers are bicoloured with pale to dark blue, wide-spreading sepals and white petals with slender spurs

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
2–5 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
pH
Acid or Alkaline or Neutral

Position

Full sun Partial shade
Aspect
South–facing or North–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)
H5

Colour & Scent

Season Stem Flower Foliage Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family
Ranunculaceae
Native to GB/Ireland
No
Foliage
Deciduous
Habit
Clump forming
Genus
Aquilegia are clump-forming herbaceous perennials with long-stalked, ternately divided basal leaves and erect, leafy stems bearing bell-shaped flowers with spreading, coloured sepals and petals with spurs, on branched stems
Name Status
Correct
Plant Range
Western N America

How to Grow

Cultivation

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

Propagation

Propagate by seed sown in pots in a cold frame as soon as seed is ripe or in spring. It can also be propagated by division in spring but the plant will be slow to recover

Suggested planting locations and garden types

  • Cottage and informal garden
  • Wildlife gardens
  • Cut flowers
  • Flower borders and beds
  • Underplanting of roses and shrubs

Pruning

Cut back foliage affected by fungal diseases

Pests

May be susceptible to aphids, leaf-mining flies and sawflies

Diseases

May be susceptible to powdery mildews and aquilegia downy mildew