Not the plant you're looking for? Search over 300,000 plants
Herbaceous Perennial

Agapanthus 'Jack's Blue'

African lily 'Jack's Blue'

'Jack's Blue' is a clump-forming perennial with semi-evergreen, strap-shaped foliage. Flower stems to 1.5m tall bear large spheres of deep purple-blue flowers in summer

Buy this plant
Size
Ultimate height
1–1.5 metres
Time to ultimate height
2–5 years
Ultimate spread
0.5–1 metres
Growing conditions
Chalk
Loam
Sand
Moisture
Moist but well–drained
pH
Acid, Alkaline, Neutral
Colour & scent
StemFlowerFoliageFruit
Spring Green
Summer Blue Purple Green
Autumn Green
Winter Green
Position
  • Full sun
Aspect

East–facing or South–facing or West–facing

Exposure
Sheltered
Drought resistance
Yes
Hardiness
H4
Botanical details
Family
Amaryllidaceae
Native to the UK
No
Foliage
Semi evergreen
Habit
Clump forming
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 fertile, moist but well-drained soil in full sun or grow in a container. In cold areas, mulch well overwinter and take containers under cover. See agapanthus cultivation

Propagation

Propagate by division every three to four years in spring

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

In late autumn remove any remaining leaves, but seedheads can be left for winter interest

Pests

May be affected by agapanthus gall midge

Diseases

A virus disease may be a problem

My Garden

Your free RHS gardening coach

Keep track of your plants with reminders & care tips – all to help you grow successfully

My plants
My calendar

My plants

My calendar

My ideas
Manage membership

My ideas

My advice

Get involved

The Royal Horticultural Society is the UK’s leading gardening charity. We aim to enrich everyone’s life through plants, and make the UK a greener and more beautiful place.