Amsonia ciliata

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Synonyms

Amsonia angustifolia

Herbaceous Perennial
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A clump-forming perennial with pretty, pale-blue starry flowers arranged in terminal clusters on erect stems with narrow green leaves. Flowers in mid-spring (May/June). Foliage turns bright golden yellow in autumn.

Position

Full sun, Partial shade

Soil Types

Chalk, Clay, Loam, Sand

Max Height

0.5-1 metres

Max Spread

0.5-1 metres

Size

Time to Maturity
2–5 years
Max Spread
0.5-1 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
East–facing or West–facing or South–facing
Exposure
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
Apocynaceae
Native to GB/Ireland
No
Foliage
Deciduous
Habit
Clump forming
Genus
Amsonia are clump-forming perennials with milky sap, lance-shaped leaves and terminal panicles of small, starry blue flowers in spring and summer
Name Status
Correct
Plant Range
Central and SE USA

How to Grow

Cultivation

Grow in any moist but well drained soil in full sun or partial shade. Will tolerate some drought

Propagation

Propagate by seed. Sow seed in containers in a cold frame in autumn or spring. Divide in spring. Root softwood or basal cuttings in early summer.

Suggested planting locations and garden types

  • Cottage and informal garden
  • Rock garden
  • Flower borders and beds

Pruning

Cut back in winter before spring growth emerges

Pests

Generally pest-free

Diseases

Generally disease-free