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Herbaceous Perennial

Agapanthus inapertus 'Cascade Diamond'

closed African lily 'Cascade Diamond'

A clump-forming, deciduous, herbaceous perennial, producing narrow, strap-shaped, mid-green foliage, to a height of around 60cm (24in) and spreading to around 60cm (24in). Hemisperical heads of white, pendulous funnel-shaped flowers, which develop a pinkish blush as they age, are produced on straight, green stems, to approximately 1.2m (4ft) high, in late summer.

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Ultimate height

1–1.5 metres

Time to ultimate height

2–5 years

Ultimate spread

0.5–1 metres

Chalk

Loam

Sand

Moisture

Well–drained

pH

Acid, Alkaline, Neutral

	Stem	Flower	Foliage	Fruit
Spring
Summer
Autumn
Winter

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)

Botanical details

Family: Amaryllidaceae
Native to the UK: No
Foliage: Deciduous
Habit: Clump forming
Potentially harmful: Al parts of the plant are harmful if eaten
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 a light, well-drained soil and a position in full sun for best flowering. Plants benefit from regular watering and feeding during the growing season April to September. Protect plants in cold areas against frost damage by wrapping with several layers of fleece. See agapanthus cultivation for more details

Propagation

Propagate by division in spring, or by seed, but bear in mind that seed-raised plants may not come true to the parent plant, where it is a hybrid cultivar

Suggested planting locations and garden types

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

Pruning

No pruning required other than to remove any dead foliage or spent flower heads

Pests

May be susceptible to slugs and snails and agapanthus gall midge

Diseases

May be susceptible to a virus

Get involved

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