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Magnolia grandiflora 'Coolwyn Gloss' - Evergreen Trees Direct

Magnolia grandiflora 'Coolwyn Gloss'

$350.00

Tax included. Shipping calculated at checkout.

Size: 40cm/45L

40cm/45L 75L 100L 200L 500L 750L 1000L

All stock is grown, maintained and graded in strict accordance with AS 4373-2007, Australian Standard for Nursery Stock.

Current Stock Height Guides

40cm/45L: 1.5m – 1.8m Approx.
70L: 1.4m – 1.9m Approx.
100L: 2.4m – 2.8m Approx.
200L: Enquire within for height guide information.
500L: Enquire within for height guide information.
750L: Enquire within for height guide information.

Height guide disclaimer: Height ranges are approximate only. As living products, plant heights naturally vary between individual plants, batches, and seasons. No guarantee is given that supplied plants will fall within the stated range. If minimum heights are required, you mustconfirm current batch heights with Evergreen Trees Direct prior to purchase. Variation in height is normal and is not grounds for return, refund, replacement, or compensation.

Mature Height & Width

Mature Height: 6m - 10m Approximately

Mature Width: 6 – 9 meters

Magnolia grandiflora 'Coolwyn Gloss' is expected to grow Approx 20 – 30 cm per year (slow to moderate).

Root Ball Dimensions

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)

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Phone: (03) 7042 3318

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About Your New Magnolia grandiflora 'Coolwyn Gloss'

Magnolia grandiflora 'Coolwyn Gloss' is a striking evergreen magnolia selected for its exceptionally glossy dark green foliage and large fragrant white flowers. The lacquer-like sheen of the leaves, set against bronze undersides, gives it a richness and presence that sets it apart from other evergreen magnolias.

Coolwyn Gloss grows to 9-12 metres tall and 6-9 metres wide, making it one of the larger evergreen magnolia cultivars. The substantial size and dense habit suit avenue planting, large feature positions, and tall privacy screens, where compact cultivars like Teddy Bear and Little Gem are better for smaller gardens.

Coolwyn Gloss is adaptable across most Australian climates, preferring well-drained, slightly acidic soils and full sun to part shade. It is low maintenance, drought tolerant once established, and pest resistant, producing large fragrant white flowers through late spring and summer.

Frequently Asked Questions

About Magnolia grandiflora 'Coolwyn Gloss'

How tall does Coolwyn Gloss Magnolia grow?

Magnolia grandiflora 'Coolwyn Gloss' grows to 9-12 metres tall and 6-9 metres wide, making it one of the larger evergreen magnolia cultivars.

How fast does Coolwyn Gloss grow?

Coolwyn Gloss has a moderate growth rate of 30-50cm per year once established.

When does Coolwyn Gloss flower?

Coolwyn Gloss produces large fragrant white flowers through late spring and summer, typically November to February across Australia.

What makes Coolwyn Gloss different from other magnolias?

Coolwyn Gloss is selected for its exceptionally glossy dark green foliage and larger size. It suits avenue planting and large feature positions, where compact cultivars like Teddy Bear and Little Gem suit smaller gardens.

Is Coolwyn Gloss evergreen?

Yes. Coolwyn Gloss is fully evergreen, holding glossy dark green foliage with bronze undersides year-round.

Where does Coolwyn Gloss grow best in Australia?

Coolwyn Gloss is adaptable across most Australian climates, preferring well-drained, slightly acidic soils and full sun to part shade.

How far apart should I plant Coolwyn Gloss?

Plant 4-6 metres apart for an avenue or screen, or as individual feature trees with room for the full canopy to develop.

Enriched Planting Mix (AO Certified)

$21.95

Features and Benefits

Organically certified product
Improves aeration for roots
A rich blend of Pure Magic Compost, composted animal manure, Gypsum, composted coarse bark and wetting agent
Excellent to mix with heavy clay soils, an organic mixture with added gypsum which is perfect for exotic plants
Revitalises tired soils, adds nutrient and organic matter, no chemical additives, weed free
Assists in retaining moisture in the soil longer after rain or watering

Directions For Use

Water plant well at least several hours prior to planting.
Dig a hole at least twice the width of the pot and 7cm deeper than the pot.
Mix Grow Better Enriched Planting Mix with the soil that has been dug out of the hole, adding about 1/3 planting mix.
Spread a 7cm layer of improved soil in the hole and remove plant from the pot. Tease roots gently if the root ball is very firm and place plant in the planting hole. Check that pot soil is level with the surrounding soil surface level, not higher or lower.
Fill in the hole with improved soil mixture, firm down soil and water well adding Grow Better Plant Starter to final watering.

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Enriched Planting Mix (AO Certified)

$21.95

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Uses in my Garden

Feature Tree
Screening or Privacy
Shade Tree
Council or Civic Landscapes

Magnolia grandiflora 'Coolwyn Gloss' 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.

Is Magnolia grandiflora 'Coolwyn Gloss' Evergreen or Deciduous?

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

Mature Height & Width

Mature Height: 6m - 10m Approximately

Mature Width: 6 – 9 meters

Magnolia grandiflora 'Coolwyn Gloss' is expected to grow Approx 20 – 30 cm per year (slow to moderate).

Growth Rate of Magnolia grandiflora 'Coolwyn Gloss'

Magnolia grandiflora 'Coolwyn Gloss' is expected to grow Approx 20 – 30 cm per year (slow to moderate).

They are considered to have a:

Medium Growth Rate

Frost Tolerance & Ideal Climate to plant Magnolia grandiflora 'Coolwyn Gloss'

Is Magnolia grandiflora 'Coolwyn Gloss' frost tolerant?

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

Does Magnolia grandiflora 'Coolwyn Gloss' Flower?

Magnolia grandiflora 'Coolwyn Gloss'

Does Magnolia grandiflora 'Coolwyn Gloss' flower?

Yes - Flowers

Flowering Period:

Summer
Autumn

Flower Type:

Fragrant
Pollinator-attracting

Flower Colour:

White

Is Magnolia grandiflora 'Coolwyn Gloss' an Australian Native Tree?

No

Magnolia grandiflora 'Coolwyn Gloss' is Native to Derived from Magnolia grandiflora, native to the southeastern United States. ‘Coolwyn Gloss’ is an Australian selection chosen for its dense foliage, improved gloss, and consistent flowering.

What is the Wildlife Value of Magnolia grandiflora 'Coolwyn Gloss' ?

Its nectar-rich flowers attract bees, beetles and other pollinating insects, while the dense evergreen canopy offers excellent shelter and nesting habitat for small birds. The decorative seed cones that follow provide food for wildlife and contribute to a more biodiverse garden ecosystem.

How much Sunlight does Magnolia grandiflora 'Coolwyn Gloss' need?

Magnolia grandiflora 'Coolwyn Gloss' will thrive best in:

Full Sun

Preferred Soil?

Magnolia grandiflora ‘Coolwyn Gloss’ performs best in well-drained, slightly acidic loam or sandy loam soils. It may struggle in heavy clay, alkaline or waterlogged soils unless improved with organic matter and coarse material to enhance drainage. Keep soil evenly moist during establishment, then maintain deep, occasional watering as the tree matures to support its drought resilience, dense evergreen foliage and reliable flowering.

Is Magnolia grandiflora 'Coolwyn Gloss' Drought Tolerant?

Is Magnolia grandiflora 'Coolwyn Gloss' Drought tolerant?

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

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How To Plant Your Magnolia grandiflora 'Coolwyn Gloss'

Site: Choose a well-drained position in full sun to part shade with room for the canopy to develop.

Soil preparation: Enrich the planting area with quality compost and aged manure for a strong establishment phase.

Hole: Dig twice as wide as the root ball and the same depth.

Planting: Position level with the surrounding soil, backfill gently, firm in, then water deeply to settle the roots.

Recommended Planting Spacing For Your Magnolia grandiflora 'Coolwyn Gloss'

Hedging and screening: 1 to 1.5 metres apart for a dense informal screen, or 80 centimetres apart for a tighter formal hedge.

Feature tree: 3 to 4 metres apart to allow the full canopy and form to develop.

Avenue planting: 3 metres apart for a uniform soft-textured avenue.

Magnolia grandiflora 'Coolwyn Gloss' is expected to grow Approx 20 – 30 cm per year (slow to moderate).

Medium Growth Rate

Long Term Care For Your Magnolia grandiflora 'Coolwyn Gloss'

Watering: Water deeply twice weekly through the first 12 months. Once established, keep the root zone consistently moist with weekly deep watering and additional water during hot dry spells.

Mulching: Apply a 5 to 7 centimetre layer of organic mulch over the root zone, keeping it 5 centimetres clear of the trunk.

Pruning: Tip prune in late winter and again in summer to build dense growth. For a formal hedge, light shaping two to three times a year keeps lines crisp.

Fertilising: Apply a slow-release general-purpose fertiliser in early spring and again in autumn for steady growth and consistent foliage colour.

Pest and disease: Hardy against most pests and diseases. Occasional inspection in warm humid conditions is all that's needed.

Planting Your Magnolia grandiflora 'Coolwyn Gloss' in Different Soil

Magnolia grandiflora performs best in rich, well-drained loam with a slightly acidic pH and consistent moisture. Adaptable to a wide range of soils when drainage and organic matter are managed well.

Sandy soil: Free-draining but enrich heavily with compost and mulch deeply to hold moisture.

Clay soil: Improve drainage with gypsum and organic compost, and mound slightly to lift the root zone.

Loam: The preferred soil for steady root development and consistent flowering.

pH: Slightly acidic preferred. Mulch with composted leaf litter or pine bark to maintain levels naturally.

Frequently Asked Questions

Q: Is the Southern Magnolia a fast-growing tree?
A: No, the Magnolia grandiflora 'Coolwyn Gloss' is considered a slow to moderately growing tree.

Q: What are the main uses of this magnolia cultivar in landscaping?
A: The Southern Magnolia is typically used for avenue planting, hedging, screening, and as a feature tree, adding elegance and natural beauty to outdoor spaces.

Q: Does it require high maintenance?
A: No, once established, this magnolia is low maintenance. However, it does need regular watering, particularly during its first year.

Q: Is the Southern Magnolia prone to pests and diseases?
A: This tree is generally resistant to pests and diseases, making it a reliable choice for landscaping.

Q: Can I grow other plants near the Southern Magnolia?
A: Yes, you can plant other garden vegetation near the Southern Magnolia, as long as it does not compete for resources and has similar sunlight and water requirements.