Agapanthus 'Big Dutch Blue'

RHS Plant Profile

African lily 'Big Dutch Blue'

Herbaceous Perennial

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A clump-forming, deciduous perennial with strap-like mid-green leaves and sturdy, upright stems with panicles of mid-blue trumpet-shaped flowers with a darker mid-rib down each petal, appearing in summer

Position

Full sun

Soil Types

Chalk, Sand, Loam

Max Height

1-1.5 metres

Max Spread

0.1-0.5 metres

Size

Time to Maturity: 2–5 years
Max Spread: 0.1-0.5 metres
Max Height: 1-1.5 metres

Growing Conditions

Chalk Sand Loam

Moisture: Moist but well–drained or Well–drained
pH: Acid or Alkaline or Neutral

Position

Full sun

Aspect: South–facing or West–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: Amaryllidaceae
Native to GB/Ireland: No
Foliage: Deciduous
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: Unresolved

How to Grow

Cultivation

Grow in fertile, moist but well-drained soil in full sun. In cold areas mulch hardy hybrids in winter. In containers grow in peat-free, loam-based compost. Apply a balanced liquid feed monthly from spring until flowering. For more information see agapanthus cultivation.

Propagation

Propagate by seed when ripe in autumn or spring and keep seedlings in cold frame overwinter - they will flower in 2-3years or propagate by division every three to four years in spring

Suggested planting locations and garden types

City and courtyard gardens
Cottage and informal garden
Patio and container plants
Flower borders and beds

Pruning

Remove leaves as they naturally die back, deadhead complete flower stems as flowers go over

Pests

May be susceptible to slugs and snails and agapanthus gall midge

Diseases

May be susceptible to a virus