Magnolia Grandiflora 'Supergem' - Evergreen Trees Direct

Magnolia Grandiflora 'Supergem'

Name: Magnolia Grandiflora 'Supergem'
Brand: Evergreen Trees Direct
SKU: MAGNOSUPGEM100L
Price: 800.00 AUD
Availability: InStock

$800.00

Tax included. Shipping calculated at checkout.

13000 in stock

Size: 100L

100L 40cm/45L

Current Stock Height Guides

40cm/45L: Enquire within for height guide information.
100L: 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 'Supergem'

Magnolia grandiflora 'Supergem' is a compact and elegant Southern Magnolia cultivar, prized for its smaller size and lush, dark green foliage with velvety bronze undersides. Growing 6–8 meters tall and 3–4 meters wide, it fits well in landscapes where space is limited but impact is desired.

This evergreen tree produces large, fragrant creamy-white flowers, 20–25 cm across, from late spring through early summer, sometimes blooming sporadically throughout the season. It features a pyramidal to rounded crown with dense branching, making it ideal as a specimen tree or privacy screen.

'Supergem' thrives in well-drained, acidic soils, tolerates urban pollution, and is moderately drought-tolerant once established. Preferring full sun to partial shade, it requires minimal pruning after flowering to maintain shape.

A perfect choice for adding classic magnolia beauty and resilience to smaller gardens or formal landscapes.

Key Information to Know

Evergreen / Deciduous

Magnolia Grandiflora 'Supergem' is an Evergreen (foliage year round) Tree

Mature Height & Width

Mature Height: 6m - 10m Approximately

Mature Width: 3 – 4 meters

Magnolia Grandiflora 'Supergem' is expected to grow Approx 20 – 40 cm per year (moderate).

Frost Tolerance

Is Magnolia Grandiflora 'Supergem' frost tolerant?

Magnolia Grandiflora 'Supergem' is Frost Tolerant – Can handle light to moderate frost once established.

Flowering Information

Magnolia grandiflora ‘Supergem’ produces large, creamy-white, lemon-scented flowers from late spring through summer, with intermittent blooms into early autumn. These impressive, upright cup-shaped flowers contrast beautifully with the dense, glossy green foliage and its warm bronze undersides, creating a bold and elegant seasonal display.

Native Information

Is Magnolia Grandiflora 'Supergem' an Australian Native? No

Magnolia Grandiflora 'Supergem' is Native to A cultivated form of Magnolia grandiflora, which is native to the southeastern United States, particularly along the coastal plains and moist forests.

Wildlife Value

Its nectar-rich blooms attract bees, beetles and other pollinating insects, while the dense evergreen canopy provides excellent year-round shelter and nesting habitat for small birds. The seed-filled cones that follow flowering also offer food for wildlife, contributing meaningfully to garden biodiversity.

Sunlight Information

Magnolia Grandiflora 'Supergem' will thrive best in:

Full Sun
Part Shade

Preffered Soil

Magnolia grandiflora ‘Supergem’ 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 and coarse material to increase drainage and soil structure. Keep soil evenly moist during establishment, then shift to deep, occasional watering as the tree matures to support strong evergreen growth, healthy root development and consistent flowering.

Botanical Information

Common Name: Supergem Southern Magnolia

Genus: Magnolia

Botanical Species: grandiflora

Family: Magnoliaceae

Botanical Name: Magnolia grandiflora 'Supergem'

Landscape Uses

Feature Tree
Screening or Privacy
Shade Tree
Council or Civic Landscapes

Magnolia Grandiflora 'Supergem' 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:

Select a location that receives full to partial sun and has well-drained, acidic soil.
Dig a hole twice as wide as the root ball and just as deep.
Carefully remove the tree from its container and place it in the hole, making sure the top of the root ball is level with the soil surface.
Backfill the hole with soil, water thoroughly, and apply a layer of mulch to help retain moisture.

Feature Planting: Space 3 – 5 m apart to showcase full shape

Hedging & Screening: Space 2.5 – 3 m apart for structured evergreen screens

Avenue Planting: Space 4 – 5 m apart for formal layout with consistent form

Caring for Magnolia grandiflora 'Supergem':

Water the tree deeply to encourage root growth, especially during dry spells.
Fertilize in the spring with a slow-release fertilizer designed for trees and shrubs.
Prune after flowering to maintain shape and overall health, removing any crossed or inward-growing branches.

How to Grow in Different Soil Types

Magnolia 'Supergem' prefers moist, well-drained soil, but adapts to a variety of conditions:

Sandy Soil: Requires organic matter and regular watering to retain moisture.

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

Loamy Soil: Ideal for healthy root development and steady growth.

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

Magnolia Grandiflora 'Supergem' is expected to grow Approx 20 – 40 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
Part Shade

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 ‘Supergem’ develops good drought tolerance. It performs reliably in warm, dry and coastal settings and maintains its full, compact habit with deep, occasional watering during extended dry periods.

Flowering Information

Does Magnolia Grandiflora 'Supergem' flower?

Yes - Flowers

Flowering Period:

Spring

Flower Type:

Fragrant

Flower Colour:

White

Frequently Asked Questions

Frequently Asked Questions:

When is the best time to plant Magnolia 'Supergem'?
Planting in early spring or fall allows the tree to establish itself during moderate temperatures.
How often should I water my Supergem Southern Magnolia?
Water regularly, especially during the first few years; once established, the tree will be more drought-resistant.
Is Magnolia 'Supergem' prone to any pests or diseases?
While it is generally hardy, it can sometimes face issues with scale insects or fungal diseases. Proper care usually keeps these problems at bay.
Can 'Supergem' be grown in a pot?
Yes, its moderate size makes it suitable for large container planting, provided it has enough room to grow.
What makes 'Supergem' different from other Magnolia grandiflora cultivars?
Its compact growth, abundant flowering, and evergreen nature make it a standout choice for gardens where space is a consideration without sacrificing the dramatic impact of magnolias.