Crocosmia masoniorum - Montbretia
Crocosmia masoniorum - Montbretia
Crocosmia masoniorum
Giant montbretia
Out of the 15 bulbs planted in spring, only one produced a stem of orange flowers by the end of August. A bit disappointed, so I'm leaving them in place hoping for better flowering next year.
julie, 24/09/2025
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Description
Crocosmia masoniorum is undoubtedly the most beautiful botanical species of montbretia. It is also one of the hardiest and least water demanding. Its summer flowering consists of large mandarin-coloured flowers that stand upright, displaying an almost golden throat in the centre of a beautiful orange corolla. They open along arching spikes, rising from thick clumps composed of smooth and tapered green leaves. This remarkably floriferous and spectacular montbretia deserves to be more widely cultivated. It has produced numerous excellent cultivars (such as 'Lucifer'), to the point that it has almost been forgotten.
Crocosmia masoniorum is native to mountainous areas north of Encobo and Umtata Eastern Cape, South Africa. Becoming rare in its original region, it grows in shaded areas on moist rocky slopes, at the source of mountain streams. Its natural habitat is subject to a cold temperate climate, with abundant summer rainfall and a cold, dry winter. In cultivation, it is reportedly cold-hardy down to -25°C (-13°F), in well-drained dry soil. It is an herbaceous bulbous plant that slowly forms clumps up to 80cm (32in) tall when in flower, and at least 50cm (20in) wide. Its deciduous leaves are rigid, lance-shaped, and longitudinally plicate. They measure approximately 2.5 to 5cm (1 to 2in) wide. The flower stem emerges in July-August, bending under the weight of the flowers arranged curiously in a "fishbone" fashion in 2 ranks. They face upwards, so that the dense inflorescence forms a beautifully arched, brightly coloured display. The vivid orange flowers are tinged with red and pink. They are funnel-shaped with 6 spreading tepals. They measure up to 5cm (2in) long and 3.5cm (1in) wide.
Their vibrant colours in yellow, orange, or red create cheerful splashes in gardens. They are splendid when combined with annuals or bushes, and blend well in natural gardens with perennials, silver foliage, or grasses. They thrive in the ground in sunny exposures and well-drained soil, and will multiply over time to become more beautiful every year. They are also excellent flowers for bouquets. The masoniorum species is particularly ornamental. It will thrive in any well-drained soil, whether it is gravelly or sandy, rich or poor, moist or occasionally dry. It cannot tolerate stagnant moisture in winter.
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Crocosmia masoniorum - Montbretia in pictures
Plant habit
Flowering
Foliage
Botanical data
Crocosmia
masoniorum
Iridaceae
Giant montbretia
South Africa
Planting and care
Plant crocosmias in full sun, ideally in spring. They need well-drained and aerated soil. Work the soil well at the time of planting and, if necessary, incorporate sand. They must be covered with 15cm (6in) of soil and spaced about 15cm (6in) apart. They like rich, loamy soils. Apply fertiliser at the time of planting and renew it every spring. While they prefer well-drained soil in winter, crocosmias need plenty of water during their growing season and cannot tolerate any drought in summer. In regions with harsh winters, it is wise to dig up the corms once the foliage has withered and store them in a frost-free location. Another alternative is to cover the bed with a thick insulating layer at the onset of winter and remove it in March.
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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