Magnolia grandiflora Alta Tmgh
Magnolia grandiflora Alta Tmgh
Magnolia grandiflora Alta 'Tmgh'
Summer Magnolia, Large-flowered Magnolia, Bull bay Magnolia, Evergreen Magnolia
Very beautiful young plant, received in very good condition.
Corinne, 05/12/2023
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Description
Magnolia grandiflora 'Alta' is a highly desirable selection of a majestic evergreen tree. With a particularly narrow and conical habit, it creates a dark and glossy fir-like silhouette in the garden, adorned with abundant evergreen foliage throughout the year. Unlike the species, it flowers well before its tenth anniversary. The spectacle takes place in summer, lasting almost three months, with magnificent flowers resembling large white tulips with a deliciously lemony fragrance.
Native to the Southeastern United States, Magnolia grandiflora thrives in bright light, heat, humidity, and rich, deep soil. Its range extends from Texas to Virginia, including the northern and central parts of Florida. 'Alta' is a recent cultivar selected for its narrower and more compact habit, as well as its rapid flowering. At maturity, this small tree reaches a height of about 7 m (23 ft) with a spread of 1.5 to 2 m (5 to 7 ft). Its growth is relatively slow, although it quickly forms a trunk from which upright branches emerge, creating a natural looking tree with a narrow pyramid shape. The flowering mainly occurs in summer, from June to August-September (in the southeastern USA, flowering begins in late April and ends in July). The large solitary flowers, 15 to 25 cm (6 to 10 in) in diameter and resembling tulips, consist of thick, pure white petals surrounding a cone covered with yellow stamens. Each flower only lasts for a day on the tree, but they continuously renew themselves. This flowering is followed by the formation of large reddish cones that are quite decorative, revealing red seeds. The evergreen leaves are alternate, simple, leathery, and 15-20 cm (6-8 in) long. They are dark and glossy on the upper surface, with a matte bronze underside.
Magnolia grandiflora 'Alta' is mainly used as a specimen tree in small gardens, but it can also be used as an avenue tree along larger properties or in a free hedge. Choose a strategic location in the garden to admire this tree, perhaps the most beautiful of all evergreens, and enjoy its lemon-scented flowering. It could be paired, for example, with another large magnolia, but one that is deciduous and blooms in spring, such as the Magnolia soulangeana.
Magnolia grandiflora Alta Tmgh in pictures
Plant habit
Flowering
Foliage
Botanical data
Magnolia
grandiflora
Alta 'Tmgh'
Magnoliaceae
Summer Magnolia, Large-flowered Magnolia, Bull bay Magnolia, Evergreen Magnolia
Cultivar or hybrid
Planting and care
The Magnolia grandiflora 'Alta' should be planted in spring in deep, rich, moist, even damp soil, in a good forest soil (pH around 6). Pure ericaceous compost is not recommended, as it is too nutrient poor. It appreciates a sunny and open position, sheltered from prevailing winds. Be careful not to break the fleshy roots and not to bury the root ball too deeply. Mulch and water in summer. Beware of severe frosts and hot, dry summers. Maintain good humidity by showering its foliage with a fine spray only in the evening. Pruning is unnecessary.
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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