Agapanthus 'Blue Ice'

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African lily 'Blue Ice'

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African lily 'Blue Ice' RHS / Joanna Kossak
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Herbaceous Perennial
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An evergreen perennial to about 1m, with strap-shaped, glossy leaves, purple at the base. Large rounded umbels of very pale blue flower are produced on strong, upright stems from mid-summer to early autumn

Position

Full sun

Soil Types

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

Position

Full sun
Aspect
West–facing or East–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)
H3
Drought Resistance
Yes

Colour & Scent

Season Stem Flower Foliage Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family
Amaryllidaceae
Native to GB/Ireland
No
Foliage
Evergreen
Habit
Clump forming
Potentially harmful
Humans/Pets (dogs, cats): harmful if eaten. Wear gloves and other protective equipment when handling. For further information and contact numbers regarding pets, see the HTA guide to potentially harmful plants
Genus
Agapanthus are clump-forming perennials with narrowly strap-shaped leaves, evergreen in some species, and erect stems bearing umbels of funnel-shaped blue or white flowers
Name Status
Accepted

How to Grow

Cultivation

In mild areas, grow in well-drained soil in a sheltered, sunny position. Otherwise grow in a container positioned in full sun. Water well during the growing season and liquid feed monthly from spring to flowering. Overwinter the whole container in a cold greenhouse. See agapanthus cultivation

Propagation

Propagate by division every three to four years in spring

Suggested planting locations and garden types

  • Coastal
  • City and courtyard gardens
  • Cottage and informal garden
  • Patio and container plants
  • Mediterranean climate plants
  • Cut flowers
  • Flower borders and beds
  • Wall side borders

Pruning

No need to cut down in autumn as the seedheads look attractive over winter

Pests

May be susceptible to slugs and snails and agapanthus gall midge

Diseases

May be susceptible to a virus