Magnolia grandiflora ‘St Mary’ – St Mary Magnolia

$1,700.00

Tax included. Shipping calculated at checkout.

Size: 200L

200L 300L 750L

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

Current Stock Height Guides

100L: 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: 5–8 metres

Mature Width: 3–5 metres

Magnolia grandiflora ‘St Mary’ – St Mary Magnolia is expected to grow 20 – 40 cm per year (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 ‘St Mary’ – St Mary Magnolia

Magnolia grandiflora ‘St Mary’ is a compact evergreen form of the Southern Magnolia, selected for its dense habit and large, showy flowers. The foliage is glossy and dark green on the upper surface with a contrasting bronze-brown underside, providing year-round interest. From late spring through summer, it produces large, creamy-white, cup-shaped flowers up to 25 cm wide, each with a rich fragrance. Mature specimens generally reach 5–8 metres in height and 3–5 metres in width, with a broadly pyramidal crown.

This cultivar has a moderate growth rate and is hardy once established. It thrives in full sun to part shade and prefers slightly acidic, well-drained soils. Magnolia grandiflora ‘St Mary’ is frost tolerant, evergreen, and low-maintenance, requiring only occasional pruning to maintain form. Once established, it shows good drought tolerance, making it adaptable to a variety of garden and landscape situations.

They look excellent when planted as specimen feature trees, used as screening in larger gardens, or incorporated into civic landscapes where year-round foliage and summer flowering are desirable. Their upright, pyramidal form also makes them suitable for avenue planting or as statement trees in formal gardens.

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.

View full details

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Enriched Planting Mix (AO Certified)

$21.95

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Uses in my Garden

Screening or Privacy
Feature Tree
Avenue Planting
Shade Tree
Council or Civic Landscapes

Magnolia grandiflora ‘St Mary’ – St Mary Magnolia 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 ‘St Mary’ – St Mary Magnolia Evergreen or Deciduous?

Magnolia grandiflora ‘St Mary’ – St Mary Magnolia is an Evergreen (foliage year round) Tree

Mature Height & Width

Mature Height: 5–8 metres

Mature Width: 3–5 metres

Magnolia grandiflora ‘St Mary’ – St Mary Magnolia is expected to grow 20 – 40 cm per year (moderate).

Growth Rate of Magnolia grandiflora ‘St Mary’ – St Mary Magnolia

Magnolia grandiflora ‘St Mary’ – St Mary Magnolia is expected to grow 20 – 40 cm per year (moderate).

They are considered to have a:

Medium Growth Rate

Frost Tolerance & Ideal Climate to plant Magnolia grandiflora ‘St Mary’ – St Mary Magnolia

Is Magnolia grandiflora ‘St Mary’ – St Mary Magnolia frost tolerant?

Magnolia grandiflora ‘St Mary’ – St Mary Magnolia is Frost Tolerant – Can handle light to moderate frost once established.

Does Magnolia grandiflora ‘St Mary’ – St Mary Magnolia Flower?

Magnolia grandiflora ‘St Mary’ produces large, creamy-white, lemon-scented flowers from late spring into summer, with intermittent blooms continuing into early autumn. These bold, upright blooms contrast beautifully with the glossy green foliage and rich bronze undersides, creating a classic and highly ornamental magnolia display.

Does Magnolia grandiflora ‘St Mary’ – St Mary Magnolia flower?

Yes - Flowers

Flowering Period:

Spring
Summer

Flower Type:

Not Applicable

Flower Colour:

Cream

Is Magnolia grandiflora ‘St Mary’ – St Mary Magnolia an Australian Native Tree?

No

Magnolia grandiflora ‘St Mary’ – St Mary Magnolia is Native to Southeastern United States, where Magnolia grandiflora grows naturally in coastal plains and moist woodlands.

What is the Wildlife Value of Magnolia grandiflora ‘St Mary’ – St Mary Magnolia ?

Its nectar-rich flowers attract bees, beetles and other pollinating insects, while the dense evergreen canopy provides excellent nesting and shelter for small birds. The seed-bearing cones that follow offer food for wildlife and contribute to improved biodiversity in ornamental garden settings.

How much Sunlight does Magnolia grandiflora ‘St Mary’ – St Mary Magnolia need?

Magnolia grandiflora ‘St Mary’ – St Mary Magnolia will thrive best in:

Full Sun
Part Shade

Preferred Soil?

Magnolia grandiflora ‘St Mary’ performs best in well-drained, slightly acidic loam or sandy loam soils. It may struggle in heavy clay, alkaline or poorly drained areas unless improved with organic matter and coarse material to enhance soil structure and drainage. Keep soil evenly moist during establishment, then maintain deep, occasional watering as the tree matures to support dense evergreen growth, healthy roots and consistent seasonal flowering.

Is Magnolia grandiflora ‘St Mary’ – St Mary Magnolia Drought Tolerant?

Is Magnolia grandiflora ‘St Mary’ – St Mary Magnolia Drought tolerant?

As a young tree it requires regular watering, but once established ‘St Mary’ develops good drought tolerance. It performs strongly in warm, dry and coastal conditions and maintains its dense, upright structure with deep, occasional watering during extended dry spells.

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How To Plant Your Magnolia grandiflora ‘St Mary’ – St Mary Magnolia

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 ‘St Mary’ – St Mary Magnolia

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 ‘St Mary’ – St Mary Magnolia is expected to grow 20 – 40 cm per year (moderate).

Medium Growth Rate

Long Term Care For Your Magnolia grandiflora ‘St Mary’ – St Mary Magnolia

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 for scale or sooty mould in warm humid conditions is all that's needed.

Planting Your Magnolia grandiflora ‘St Mary’ – St Mary Magnolia 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.