Magnolia grandiflora 'Alta' - Evergreen Trees Direct

Magnolia grandiflora 'Alta'

Name: Magnolia grandiflora 'Alta'
Brand: Evergreen Trees Direct
SKU: MAGNOLALTA300L
Price: 1500.00 AUD
Availability: InStock

$1,500.00

Tax included. Shipping calculated at checkout.

998 in stock

Size: 300L

300L 100L 40cm/45L

Current Stock Height Guides

40cm/45L: 1.4m – 1.8m Approx.
100L: 2.4m – 2.8m Approx.
300L: Enquire within for height guide information.

Trade Customers

We supply advanced trees to landscapers, developers, architects, and councils Australia-wide. Trade clients receive fast quotes, expert advice, and access to premium stock with reliable freight.

About Magnolia grandiflora 'Alta'

Magnolia grandiflora 'Alta', known as Alta Southern Magnolia, is a majestic evergreen tree valued for its glossy dark green foliage and large, fragrant white flowers. Growing 10–15 meters tall and 6–9 meters wide, it has an upright, pyramidal form with a well-structured crown.

This cultivar thrives in full sun to partial shade, adapts to various soils, and tolerates urban pollution. It requires moderate maintenance and regular watering during establishment but becomes drought-tolerant over time. Ideal as a specimen or shade tree, Alta Southern Magnolia adds timeless elegance and captivating fragrance to gardens, parks, and urban landscapes.

Key Information to Know

Evergreen / Deciduous

Magnolia grandiflora 'Alta' is an Evergreen (foliage year round) Tree

Mature Height & Width

Mature Height: 6m - 10m Approximately

Mature Width: 6 – 9 meters

Magnolia grandiflora 'Alta' is expected to grow Approx 30 – 50 cm per year (moderate).

Frost Tolerance

Is Magnolia grandiflora 'Alta' frost tolerant?

Magnolia grandiflora 'Alta' is Frost Tolerant – Can handle light to moderate frost once established.

Flowering Information

Magnolia grandiflora ‘Alta’ produces large, creamy-white, lemon-scented flowers from late spring through summer, with intermittent blooms into early autumn. The upright, cup-shaped flowers stand out beautifully against the dense, glossy green foliage, creating a refined and long-lasting seasonal display.

Native Information

Is Magnolia grandiflora 'Alta' an Australian Native? No

Magnolia grandiflora 'Alta' is Native to A cultivated form of Magnolia grandiflora, which is native to the southeastern United States, where it grows naturally in moist forests and coastal plains.

Wildlife Value

Its large, nectar-rich flowers attract bees, beetles and pollinating insects, while the dense evergreen canopy provides year-round shelter and nesting habitat for small birds. The seeds that develop within the fruiting cones are also eaten by birds and contribute to garden biodiversity.

Sunlight Information

Magnolia grandiflora 'Alta' will thrive best in:

Full Sun

Preffered Soil

Magnolia grandiflora ‘Alta’ performs best in well-drained, slightly acidic loam or sandy loam soils. It may struggle in heavy clay, alkaline or poorly drained ground unless improved with organic matter to enhance soil structure and drainage. Keep soil evenly moist during establishment, then transition to deep, occasional watering as the tree matures to support strong evergreen growth, narrow form and reliable flowering.

Botanical Information

Common Name: Alta Southern Magnolia

Genus: Magnolia

Botanical Species: grandiflora

Family: Magnoliaceae

Botanical Name: Magnolia grandiflora 'Alta'

Landscape Uses

Feature Tree
Screening or Privacy
Avenue Planting
Shade Tree

Magnolia grandiflora 'Alta' works in an:

Formal Garden – structured, symmetrical design with clipped shapes.
Modern Garden – sleek, minimal, and design-led planting.
Cottage Garden – romantic mix of flowers, colour, and texture.
Low-maintenance Garden – resilient choices for easy care and year-round appeal.

Planting, Spacing & Care

How to plant Magnolia grandiflora 'Alta'

Choose a location with well-drained soil and full sun to partial shade.
Dig a hole twice as wide and as deep as the root ball.
Amend the soil with compost or other organic matter as needed.
Place the tree in the hole and backfill with soil, pressing firmly to eliminate air pockets.
Water thoroughly and mulch around the base to retain moisture and suppress weeds.

Feature Planting: Space 6 – 9 m apart for full form and canopy development

Hedging & Screening: Space 3 – 4 m apart for tall, formal evergreen screening

Avenue Planting: Space 5 – 6 m apart for structured, upright silhouette

Caring for Your Tree:

Watering: Provide consistent moisture, especially during the first few years. Deep watering is essential for the tree's overall health.
Pruning: Minimal pruning is needed, primarily to remove dead or diseased branches. Prune lightly in late winter or early spring.
Fertilization: Apply a balanced, slow-release fertilizer in spring to promote healthy growth and vibrant flowering.

How to Grow in Different Soil Types

Magnolia 'Alta' prefers moist, well-drained soil, but is adaptable to a variety of conditions:

Sandy Soil: Add organic matter and mulch to retain moisture.

Clay Soil: Improve drainage with compost and gypsum to prevent waterlogging.

Loamy Soil: Ideal for strong root establishment and healthy growth.

Acidic or Alkaline Soil: Prefers slightly acidic to neutral soil, but tolerates mild alkalinity.

Magnolia grandiflora 'Alta' is expected to grow Approx 30 – 50 cm per year (moderate).

Medium Growth Rate

Root Ball Dimensions (Width × Depth) For Planting

Use this as a reference when digging your planting hole. We recommend digging at least 10% wider than the dimensions below to encourage strong root development.

30cm Pot: 33cm (W) × 30cm (D)
40cm/45L Pot: 44cm (W) × 41.5cm (D)
50cm Pot / 70L Pot: 55cm (W) × 41.8cm (D)
100L Bag: 50.6cm (W) × 52.8cm (D)
150L Bag: 66cm (W) × 55cm (D)
200L Bag: 71.5cm (W) × 60.5cm (D)
300L Bag: 88cm (W) × 63.8cm (D)
400L Bag: 99cm (W) × 66cm (D)
500L Bag: 122cm (W) × 66cm (D)
750L Bag: 134cm (W) × 69cm (D)
1000L Bag: 146.3cm (W) × 71.5cm (D)
2000L Bag: 176cm (W) × 82.5cm (D)

Ideal Conditions

Subtropical QLD (Brisbane, Gold Coast, Sunshine Coast)
Inland QLD (Darling Downs, Central QLD)
Northern NSW (Byron, Coffs, Armidale)
Sydney & Central Coast
South Coast NSW (Illawarra to Bega)
Inland NSW / Tablelands (Orange, Bathurst, Canberra)
Melbourne & Surrounds (Metro, Bayside, Geelong, Bellarine, Mornington)
Western District & Central VIC (Ballarat, Bendigo, Hamilton)
Gippsland (Latrobe Valley, East Gippsland)
Adelaide Metro & Coastal
Adelaide Hills & Barossa

Thrives in

Full Sun

Frost Tolerance

Frost Tolerant – Can handle light to moderate frost once established.

Drought Tolerance

As a young tree it requires regular watering, but once established ‘Alta’ develops good drought tolerance. It performs reliably in warm, dry and urban environments and maintains its narrow, columnar form with deep, occasional watering during extended dry periods.

Flowering Information

Does Magnolia grandiflora 'Alta' flower?

Yes - Flowers

Flowering Period:

Summer
Autumn

Flower Type:

Bell-shaped
Clustered
Pollinator-attracting

Flower Colour:

White

Frequently Asked Questions

Frequently asked questions

Q: When does Magnolia grandiflora 'Alta' bloom? A: The tree blooms in late spring to summer, producing large, fragrant white flowers.

Q: Is Magnolia grandiflora 'Alta' drought tolerant? A: Yes, the tree is tolerant of drought once established.

Q: What is the mature size of Magnolia grandiflora 'Alta'? A: The tree can reach a height of 12-18 meters and a width of 4-6 meters.

Q: Can Magnolia grandiflora 'Alta' be used as a screen or shade tree? A: Yes, the tree is suitable for use as a screen or shade tree, and its evergreen foliage provides year-round interest.

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