Magnolia sieboldii Colossus
Magnolia sieboldii Colossus
Magnolia sieboldii Colossus
Magnolia sieboldii Colossus
Magnolia sieboldii Colossus
Magnolia sieboldii Colossus
Magnolia sieboldii Colossus
Magnolia sieboldii Colossus
Magnolia sieboldii Colossus
Siebold's Magnolia, Oyama Magnolia
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This plant carries a 24 months recovery warranty
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We guarantee the quality of our plants for a full growing cycle, and will replace at our expense any plant that fails to recover under normal climatic and planting conditions.
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Description
The Magnolia sieboldii Colossus is a beautiful improvement of the Siebold Magnolia, more adapted to the sun, with faster growth, capable of flowering at a young age. Slightly shorter than the original species, this variety also has larger leaves and very beautiful fragrant pendulous flowers, semi-double to double. It is an unusual small tree, with a wide habit, exotic appearance, which will seduce enthusiasts of magnolias.
The Magnolia sieboldii Colossus is a horticultural selection by Dr. Augie Kehr from June 1997. The botanical species, native to East Asia, is sensitive to heat and sun. It is a small tree that has a spreading habit, more wide than tall. The Colossus variety, slightly smaller, reaches about 7-8 m (23-26ft) in height and 10-11 m (33-36ft) in spread. The plant has obovate leaves, of medium green, measuring 15 to 30 cm (6 to 12in) long and 10 to 15 cm (4 to 6in) wide. Flowering occurs from May to July. The pure white flowers, adorned at the center with a large cluster of pinkish-purple stamens, are initially upright and then bend towards the ground. Composed of 10 to 15 white petals, they form a bell-shaped flower reaching 15 cm (6 in) in diameter. In the center, there is a crown of dark pinkish-purple stamens, very decorative. These flowers withstand harsh weather conditions very well and emit a light citrus fragrance. After pollination, large fruits form and turn pink in autumn. The deciduous foliage turns yellow in autumn before falling.
Completely hardy, this Magnolia Colossus requires a moist, light and humus-rich soil, as it does not tolerate limestone well. It is best displayed as a standalone specimen or in the back of a border. This superb plant also pairs well with flowering dogwoods and anemone trees, which appreciate the same environments.
Magnolia sieboldii Colossus in pictures
Plant habit
Flowering
Foliage
Planting and care
The Magnolia sieboldii Colossus is grown in a sunny or semi-shade position, full shade does not suit it. Hot and dry climates are also not suitable for it. Plant it in a soil that remains slightly moist, rich in humus, deep and well-drained. In limestone soil, make a large planting hole and add ericaceous compost mixed with your garden soil, and you will need to amend with iron or organic matter from time to time to replenish the stock of minerals available to the plant. In case of drought, monitor watering. Pruning is not necessary, however you can open up the center of the bush by removing some interlacing branches.
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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