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Herbaceous Perennial

Agapanthus 'Happy Blue'
  • RHS AGM

African lily 'Happy Blue'

'Happy Blue' is an evergreen perennial growing to around 60-70cm tall with dark green, strappy leaves. Flowerheads produce around 35-40 florets per head of light violet-blue flowers from summer onwards, followed by attractive seed heads once the flowers die off in the autumn.

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Size
Ultimate height
0.5–1 metres
Time to ultimate height
2–5 years
Ultimate spread
0.1–0.5 metres
Growing conditions
Chalk
Loam
Sand
Moisture
Moist but well–drained, Well–drained
pH
Acid, Alkaline, Neutral
Colour & scent
StemFlowerFoliageFruit
Spring Green
Summer Blue Purple Green
Autumn Green
Winter Green
Position
  • Full sun
Aspect

South–facing or West–facing or East–facing

Exposure
Sheltered
Hardiness
H3
Botanical details
Family
Amaryllidaceae
Native to the UK
No
Foliage
Evergreen
Habit
Clump forming
Potentially harmful
Harmful if eaten. 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

Unresolved

How to grow

Cultivation

In mild areas, grow in well-drained soil in a sunny, sheltered position. Otherwise grow in a container and position in full sun. Water 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
  • Patio and container plants
  • Cottage and informal garden
  • Flower borders and beds
  • Cut flowers
Pruning

No need to cut down in the 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

Get involved

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