A picture of a Agapanthus 'Double Diamond'

Agapanthus 'Double Diamond'

Agapanthus 'Double Diamond'

Also known as

African Blue Lily 'Double Diamond', Lily of the Nile 'Double Diamond'

Photo by EddingtonHouseNursery (All rights reserved)

Full Sun
Moderate care
Light watering
Frost Hardy


RHS hardiness


Minimum temperature

Expected size








2 years to reach maturity


  • spring
  • summer
  • autumn
  • winter

This plant has no fragrance

Agapanthus 'Double Diamond' Overview

Agapanthus 'Double Diamond' is dwarf deciduous, clump forming perennial that produces striking white, funnel shaped flowers that form a rounded head standing only 25cm above narrow, green coloured strap-shaped leaves. African Lily 'Double Diamond' gives a lovely summer display, looking especially stunning as part of a Mediterranean or mixed planting scheme. In areas where temperatures drop below minus 5C, it will happily grow in containers that can be moved undercover during the winter months. Like the fairy tale character Goldilocks, Agapanthus like their growing space to be just so. Contra to popular wisdom, Agapanthus do not like to be overcrowded in their pots; however they also take a while to establish if planted up into too large spaces. As a rule of thumb, pot on every two years using a gritty multipurpose mix. This cultivar is protected under intellectual property laws by Plant Breeders' Rights. These provide the breeder of new plants exclusive control over the plant material for a set amount of time. This cultivar has earnt a Royal Horticultural Society Award of Garden Merit.

Common problems with Agapanthus 'Double Diamond'

How to harvest Agapanthus 'Double Diamond'

Seeds to be harvested in autumn when the seed pods have dried out. Flower stalks may be cut for flower arrangements during summer months.

How to propagate Agapanthus 'Double Diamond'


Lift and divide clusters every four years in winter when the plant is dormant.


Seeds must be sown fresh in the autumn, or if you are in an area where you receive below freezing temperatures keep the seeds cool in the fridge and sow in the spring.

Special features of Agapanthus 'Double Diamond'

Attractive flowers

Attractive clusters of nodding funnel shaped flowers.

Attracts useful insects

Attracts insects like bees and butterflies.

Drought resistant

This plant can withstand drought periods, as it fleshy rhizomes stores water reserves.

Pot plant

Grows very well in large pots.