Southern magnolia
Magnolia grandiflora · Magnoliaceae
📷 DavetheMage · CC BY 3.0
The gardener's calendar
In autumn, ease off feeding and take the chance to clean up around southern magnolia and prepare for winter.
ID card
- Foliage
- Evergreen, dark green, leathery and glossy
- Blooming
- May to June, large creamy white flowers, delicately fragrant
- Mature size
- 8 m tall, pyramidal to columnar habit
- Growth
- Moderate to slow
- Hardiness
- Tolerates down to about -15 °C
- Origin
- Southeastern United States
- Soil type
- Rich, well-drained, slightly acidic to neutral
✓ Taxonomy verifiedSource: AI estimate · hardiness: reliability medium.
Expert tips
The key tip
Magnolia grandiflora produces magnificent white flowers from May to September. It loves deep soil that's slightly moist but well-drained.
The common mistake
Planting it in compact, clay-heavy soil: its roots suffocate and it slowly deteriorates despite looking healthy at first.
The pro's trick
Wait until it's 5-7 years old before expecting a beautiful bloom.
Care
Exposure
Install your Magnolia grandiflora in full sun for generous blooming. It tolerates partial shade, but produces fewer flowers in such conditions. Protect it from strong winds that can damage its large leaves and delicate flowers.
Watering
Water regularly during the first year after planting to encourage rooting. Afterwards, keep the soil moist but not waterlogged, especially during dry summer periods. In winter, reduce watering.
Soil Preparation
Enrich the soil with compost or heather soil to improve its slight acidity. Ensure good drainage to prevent root suffocation. The magnolia appreciates loose, deep soils.
Pruning and Trimming
Pruning is not essential for magnolia grandiflora. Simply remove dead, diseased, or poorly oriented branches after flowering. Prefer light pruning to preserve its natural and majestic form.
Fertilization
Apply balanced fertilizer or one specific for acid-loving plants in spring. An annual application of well-decomposed compost is generally sufficient. Avoid nitrogen-rich fertilizers that would stimulate foliage at the expense of flowering.
Diseases and Pests
Magnolia grandiflora is generally robust. Watch for spider mites in hot, dry climates. In case of excess humidity, root rot may occur: improve drainage. No harsh chemical treatment is usually necessary.
Did you know?
The Magnolia grandiflora is one of the oldest flowering plant species on Earth, with ancestors that bloomed alongside dinosaurs over 100 million years ago. The official flower of Louisiana in the United States, it symbolizes the elegance of the American South and has inspired painters and writers. Its hard wood and evergreen foliage make it a symbol of durability and natural nobility.
Where to buy it
Best planted in autumn so the roots settle in before summer, or in early spring once the frost has passed. Pick a plant with healthy foliage and roots that are not exposed. Best time: March, October, November.
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Tips generated and checked by Viridia — adapt them to your local climate.