Magnolia grandiflora Mainstreet
Magnolia grandiflora Mainstreet
Magnolia grandiflora Mainstreet
Southern Magnolia, Bull Bay
I received my order on time, the young plant arrived in perfect condition thanks to the appropriate packaging and it's very well formed, thank you, it will soon find its place next to its siblings in the wooded garden.
Benoît, 09/10/2025
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Description
The Magnolia grandiflora 'Mainstreet' is a cultivar appreciated for its narrow and pyramidal habit, suitable for small gardens or urban gardens. This evergreen tree also offers large fragrant white flowers, appearing from summer to autumn, as well as beautiful dark green glossy foliage with a reddish-brown underside. Resistant to cold down to -18°C, this beautiful magnolia makes a strong impression as a single specimen or in a row along a long driveway.
The Magnolia grandiflora belongs to the Magnoliaceae family. Native to the southeastern United States, the botanical species is naturally found in humid coastal forests. The 'Mainstreet' cultivar was selected for its particularly narrow and compact habit. This magnolia has a very narrow pyramidal habit, almost fastigiate, which tends to slightly round with age. It reaches about 12 to 15 meters in height and 4 to 5 meters in width. Its growth is relatively fast.
Its evergreen foliage consists of large ovate leaves, measuring between 12 and 20 cm long. They are dark green and glossy on the top, while the underside is reddish-brown, covered with a soft fuzz. The flowers, wide and open cup-shaped, measure between 15 and 20 cm in diameter. They are creamy white and diffuse a pleasant lemony fragrance. Flowering occurs from early summer to autumn, from June-July to October. This magnolia also produces upright cone-shaped fruits, containing red seeds, which appear after flowering. The trunk, straight and sturdy, is covered with smooth gray bark in the early years, becoming more fissured over time. Magnolia grandiflora 'Mainstreet' tolerates pruning well, allowing control of its development in tighter spaces.
The less bulky Magnolia grandiflora 'Mainstreet' is particularly appreciated in urban or small gardens. It can be planted in a row to border a driveway or path. Its slender habit and moderate growth will be put to good use at the back of a border or as a single specimen in a small garden. Planted against a sunny wall, it offers a magnificent summer flowering display while being protected from cold winds. To accompany it, choose Japanese Camellias with evergreen foliage that bloom in winter. It can also be paired with Cercis canadensis 'Red Force', a small tree with purple foliage and pink flowers in spring, or with Viburnum tinus 'Giganteum', for a touch of greenery throughout the year. The Abelia chinensis will complement this set nicely with its fragrant flowering that renews from summer to early autumn.
Magnolia grandiflora Mainstreet in pictures
Plant habit
Flowering
Foliage
Botanical data
Magnolia
grandiflora
Mainstreet
Magnoliaceae
Southern Magnolia, Bull Bay
Cultivar or hybrid
Planting and care
The Magnolia grandiflora 'Mainstreet' should be planted in spring, in deep, rich, fresh, consistent soil, in a good forest compost (pH 6) enriched with clayey garden soil. Pure heather soil is not recommended as it is too poor in nutrients. Clearly calcareous soils are not suitable for it. In warmer climates and mild winters, you can plant it in autumn so it can benefit from winter rainfall. It appreciates a sunny and open exposure, sheltered from prevailing winds, and will tolerate light shade further south. It is advisable to protect young plants from severe winter frosts during the first two or three years: dress them in a thick wintering veil if severe frosts are forecast, then remove it as soon as the temperatures soften a bit. The weight of the snow weakens the branches which can break, although this variety is rather less sensitive than others. As an adult, this variety proves to be quite cold-resistant, down to about -18°C. Be careful not to break the fleshy roots and not to bury the root ball too deeply. Mulch and water in summer, paying particular attention to hot and dry summers; this magnolia prefers the soil to remain fairly moist in summer. Maintain good humidity by showering its foliage with a fine spray only in the evening.
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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