Agapanthus 'Royal Blue'

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African lily 'Royal Blue'

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African lily 'Royal Blue' RHS
African lily 'Royal Blue' RHS / Joanna Kossak
African lily 'Royal Blue' RHS / Joanna Kossak
African lily 'Royal Blue' RHS / Joanna Kossak
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Herbaceous Perennial
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A herbaceous perennial up to 75cm high with deciduous, narrow, strap-shaped green leaves and heads of rich violet-blue, bell-shaped flowers in late summer

Position

Full sun

Soil Types

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

Position

Full sun
Aspect
West–facing or South–facing or East–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)
H4

Colour & Scent

Season Stem Flower Foliage Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family
Amaryllidaceae
Native to GB/Ireland
No
Foliage
Deciduous
Habit
Clump forming
Potentially harmful
Skin irritant/allergen. Wear gloves and other protective equipment when handling
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

Grow in moisture-retentive but well-drained soil in full sun, and in colder areas provide winter protection with a loose mulch; in containers, grow in peat-free, loam-based compost, water freely when in growth but sparingly in winter, and apply a balanced liquid fertilizer monthly from spring until flowering; for more advice, see Agapanthus cultivation

Propagation

Propagate by division between spring and early summer, or in early autumn after plants have finished flowering

Suggested planting locations and garden types

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

Pruning

No pruning required

Pests

May be susceptible to slugs and snails and agapanthus gall midge

Diseases

May be susceptible to a virus