Agapanthus Navy Blue
Agapanthus Navy Blue
Agapanthus Navy Blue
Agapanthus Navy Blue
Agapanthus Navy Blue
Agapanthus Navy Blue
Agapanthus Navy Blue
Agapanthus Navy Blue
African Lily, Lily of the Nile
Plant arrived dead
Marc, 11/12/2025
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Description
Agapanthus 'Navy Blue', also known as 'Midnight Star', is a variety of Agapanthus that is very popular for its umbels of deep and intense navy blue flowers. This particularly floriferous and vigorous variety is medium-sized. Its deciduous foliage in wide ribbons of bright green elegantly covers the ground throughout the beautiful season. When its flowers appear, usually in July-August, it metamorphoses into a very blue airy bouquet. Ideal in large pots on the terrace, or planted in small groups near high-traffic areas, this moderately hardy (-10°C (14°F)) beautiful plant should be installed in well-drained soil, in full sun, and should never lack water during its growth period.
Agapanthus are plants of the lily family, native to South Africa, which hybridize naturally in the wild or in our gardens. Agapanthus 'Navy Blue' stands out for its great floribundity. This plant develops and multiplies quickly from a stump with fleshy rhizomes, forming a dense clump of linear and thick foliage, of a shiny green, at least 40cm (16in) in diameter, expanding over time. The abundant flowering takes place in summer, more or less early depending on the climate, and lasts about 6 weeks. Strong and sturdy stems about 60cm (24in) tall carry light hemispherical umbels, 10 to 13cm (4 to 5in) in diameter, composed of about thirty small bell-shaped flowers of ultramarine blue, carried by long peduncles.
The 'Navy Blue' Agapanthus is a delightful variety to integrate into a flower garden, bringing an exotic and light touch to sunny borders, while requiring little maintenance. This variety should be reserved a somewhat protected and south-facing location in our coldest regions, and it is important not to forget to apply a thick mulch on the stump in winter, as a precaution. Whether in a border, rockery, pot or planter, the 'Navy Blue' Agapanthus is suitable for a wide range of uses. It is very beautiful when associated with other mauve, white or blue varieties in a clean decor. It is also very decorative in plantings with an exotic connotation, with Kniphofias, Hemerocallis, shrubby salvias or Phlomis fruticosa.
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Agapanthus Navy Blue in pictures
Flowering
Foliage
Plant habit
Botanical data
Agapanthus
Navy Blue
Amaryllidaceae
African Lily, Lily of the Nile
Cultivar or hybrid
Planting and care
The 'Navy Blue' Agapanthus is grown in full sun in a warm location, in a protected area facing south. It withstands drought well. Place it in a soil that is rich and moist, but above all, very well-drained in winter. Water Agapanthus regularly during the growth period (twice a week). However, avoid watering them while the plant is dormant. In winter, Agapanthus fears excessive moisture and does not like waterlogged soil. That's why you should mulch the base with a layer of dead leaves about 20cm (8in) thick on the plants' stump and cover them with a mesh to prevent wind damage. Snow is a very good protection against excess moisture and cold. If potted, bring the plant indoors to a non-heated but frost-free area. When planting, place it 30cm (12in) deep in a pot with leaf compost and compost, as the roots are fleshy. Once established in the ground, do not disturb the agapanthus anymore. Remove dead leaves in autumn. Cut back the faded stems so that the plant does not exhaust itself producing seeds.
Planting period
Intended location
Care
Planting & care advice
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Hardiness is the lowest winter temperature a plant can endure without suffering serious damage or even dying. However, hardiness is affected by location (a sheltered area, such as a patio), protection (winter cover) and soil type (hardiness is improved by well-drained soil).
In temperate climates, pruning of spring-flowering shrubs (forsythia, spireas, etc.) should be done just after flowering.
Pruning of summer-flowering shrubs (Indian Lilac, Perovskia, etc.) can be done in winter or spring.
In cold regions as well as with frost-sensitive plants, avoid pruning too early when severe frosts may still occur.
The harvesting period indicated on our website applies to countries and regions in USDA zone 8 (France, England, Ireland, the Netherlands).
In colder areas (Scandinavia, Poland, Austria...) fruit and vegetable harvests are likely to be delayed by 3-4 weeks.
In warmer areas (Italy, Spain, Greece, etc.), harvesting will probably take place earlier, depending on weather conditions.
The sowing periods indicated on our website apply to countries and regions within USDA Zone 8 (France, UK, Ireland, Netherlands).
In colder areas (Scandinavia, Poland, Austria...), delay any outdoor sowing by 3-4 weeks, or sow under glass.
In warmer climes (Italy, Spain, Greece, etc.), bring outdoor sowing forward by a few weeks.
The planting period indicated on our website applies to regions in USDA Zone 9a (East Coast and Midlands: Dublin, Wexford, Waterford, Kilkenny, Portlaoise). It will vary depending on where you live:
- On the west coast and in the north-west (Galway, Limerick, Sligo, Donegal, Westport), delay planting by 1 to 2 weeks in spring and bring it forward by 1 to 2 weeks in autumn compared to the dates given, preferably choosing periods without strong winds.
- In the inland hills and plateaus (Wicklow Mountains, Macgillycuddy’s Reeks, Connemara, Killarney), it is best to plant in spring (April–May) or autumn (September–October), avoiding periods of waterlogged soil in winter and strong winds, which pose the main risk to newly planted trees in these areas.
The flowering period indicated on our website applies to regions in USDA Zone 9a, such as the East Coast and Midlands, including Dublin, Wexford, Waterford, Kilkenny and Portlaoise.
This will vary depending on where you live:
- On the west coast and in the northwest (Galway, Limerick, Sligo, Donegal and Westport), it will be delayed by one to two weeks compared to the given dates, due to stronger Atlantic winds and less spring sunshine.
- In the inland hills and plateaus (the Wicklow Mountains, the Macgillycuddy's Reeks, Connemara and Killarney), flowering will be delayed by two to three weeks. Flowering mainly occurs between May and July, with the limiting factors being less frost and more of the excessive humidity, strong winds and lack of sunshine that are characteristic of these areas.
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