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Magnolia soulangeana Emperor

Magnolia x soulangeana Emperor
Magnolia

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First bloom, March 2024

Richard , 15/03/2024

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This breathtaking magnolia produces huge dark pink flowers that can reach 30 cm (12 in) in height and 20 cm (8 in) in diameter. It blooms abundantly in spring and again in summer. The growth of this bush is quite moderate (5 m (16 ft) in height and 3.5 m (11 ft) in width at 10 years old). It is a deciduous and hardy variety that can be grown in pots or in the ground. The 'Emperor' Magnolia thrives in any good, slightly acidic garden soil that remains moist in summer.
Flower size
30 cm
Height at maturity
5 m
Spread at maturity
3.50 m
Exposure
Sun, Partial shade
Hardiness
Hardy down to -23°C
Soil moisture
Moist soil
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Best planting time March, October
Recommended planting time March to May, September to November
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Flowering time April to July
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Description

Magnolia x soulangeana 'Emperor' is a unique hybrid Magnolia with its large flowers and perpetual flowering in summer. Its extraordinary flowers, of a dreamy dark pink, first bloom in spring on its naked branches, and then again in summer amoungst the foliage. Unforgettable, like all flowering magnolias, this one may be even more so. Hardy and easy to grow in any good non-alkaline garden soil, this wonderful small tree also adapts to container cultivation for a few years.

 

The 'Emperor' Magnolia, from the magnolia family, is a recent horticultural selection made in New Zealand. One of its parents, the Magnolia x soulangeana, is the origin of a magnificent lineage of cultivars. This hybrid is the result of cross-breeding between Magnolia denudata and M. liliflora, two Asian species. 'Emperor' first presents a pyramidal habit, then its crown becomes rounded over time. It slowly forms a large bush or a small tree with a rounded and spreading habit, taller than it is wide. It reaches an average height of 5 meters (16 feet) and a width of 3.5 meters (11 feet) at ten years old. The leaves, 10 to 15 cm (4 to 6in) long, have a rounded and slightly pointed tip. Deciduous, the dark green foliage, paler and finely hairy on the underside, turns yellow-brown in autumn before falling. From March to May, depending on the region, and again in June-July, its immense solitary cup-shaped flowers of dark pink color appear. Erect, they open from buds protected by velvety bracts, and are formed by 9 waxy and thick tepals (undifferentiated sepals and petals), measuring up to 30 cm (12 in) long. Opening widely, the 20 cm (8 in) diameter flower reveals a center occupied by numerous reddish-brown stamens. This is followed by red to brown fruits in the shape of cylindrical cones, containing red seeds. The longevity of the Magnolia x soulangeana can exceed one hundred years.

 

This 'Emperor' Magnolia enhances this small tree that we have all admired at some point. It will work wonders in both medium-sized gardens and large parks. Among the most accommodating, it shows great generosity in any good deep, moist, and non-alkaline garden soil. It is most often used as a solitary specimen in the middle of a short grass meadow, where it outshines all other plants from early spring to the heart of summer. To accompany it, consider other bushes such as mock oranges, lilacs, beautybushes, botanical roses, and many others. The 'Emperor' Magnolia can also be combined with a mass planting of acid-loving shrubs (Rhododendrons, Camellias, Hydrangeas, Pieris, Daphnes...) for a Japanese-style garden. Note that the Magnolia x soulangeana is one of the ornamental trees that best withstand atmospheric pollution.

 

Magnolia soulangeana Emperor in pictures

Magnolia soulangeana Emperor (Foliage) Foliage

Plant habit

Height at maturity 5 m
Spread at maturity 3.50 m
Habit spreading
Growth rate normal

Flowering

Flower colour pink
Flowering time April to July
Inflorescence Solitary
Flower size 30 cm
Fruit colour black

Foliage

Foliage persistence Deciduous
Foliage colour green

Botanical data

Genus

Magnolia

Species

x soulangeana

Cultivar

Emperor

Family

Magnoliaceae

Other common names

Magnolia

Origin

Cultivar or hybrid

Product reference163471

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Planting and care

The Magnolia x soulangeana 'Emperor' prefers sheltered positions, sunny to partially shaded exposures, a moist to humid, well-drained, rich and humus-rich soil, deep, neutral to acidic. It tolerates clayey and slightly alkaline soils, not waterlogged. However, it does not tolerate excess lime, poor and dry soils, or windy locations. It enjoys good hardiness, but it is essential to protect young subjects from frost in the first years following planting. Note that late frosts and cold wind can damage flower buds and young leaves, thus affecting flowering.

Magnolia can be planted in spring or autumn, outside the frost period, ensuring it is installed sheltered from cold winds. Prepare a hole, 80 cm (32 in) on each side and as deep, with a good supply of ericaceous compost. Be careful when placing it in the hole, so as not to break the fleshy but fragile roots. Immediate watering with non-lime water (rainwater) helps to settle the soil around the roots. During the first year of planting, Magnolia requires watering once a week. It will appreciate a mulch once a year in spring. For planting in alkaline soil, it will be necessary to replace or amend your soil with pine bark, leaf compost, and ericaceous compost.

For better establishment of your tree, do not choose plants that are too large (1.50 m (5ft) is a good size). Staking may be necessary if the tree is a large specimen. Water generously in the early years. Since the Magnolia does not tolerate prolonged drought, the soil should remain slightly moist (but not waterlogged) throughout the summer. It is recommended to mulch the base to retain moisture during the hot season, enrich the soil, and protect it from the cold in winter. During the first years, pruning after flowering can be done to shape its silhouette. The growth of this tree is slow in the first years after planting. It will be well established after 4 to 5 years, its growth will accelerate, and pruning will no longer be necessary, except for removing dead wood and rebalancing its habit. Since its roots are fragile, transplanting should be avoided. The only enemies of Magnolia are pests such as scale insects, snails, and slugs that attack young plants, and diseases such as root rot (in excessively waterlogged soil), coral disease, and Pestalozzia.

 

Planting period

Best planting time March, October
Recommended planting time March to May, September to November

Intended location

Suitable for Meadow, Woodland edge
Type of use Border, Free-standing, Container
Hardiness Hardy down to -23°C (USDA zone 6a) Show map
Ease of cultivation Beginner
Planting density 1 per m2
Exposure Sun, Partial shade
Soil pH Neutral, Any
Soil type Clayey (heavy), Silty-loamy (rich and light)
Soil moisture Moist soil, Well-drained, humus-rich, light and fertile.

Care

Pruning instructions During the first few years, a pruning after flowering can be done to shape its silhouette.
Pruning Pruning recommended once a year
Pruning time May
Soil moisture Moist soil
Disease resistance Good
Overwinter Can be left in the ground
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