Silver banksia
Banksia marginata · Proteaceae
The gardener's calendar
In autumn, ease off feeding and take the chance to clean up around silver banksia and prepare for winter.
ID card
- Foliage
- Evergreen
- Flowering
- Autumn to spring (September to November in Southern Hemisphere)
- Adult size
- 1.5 to 3 m in height, 1 to 2 m in width
- Growth
- Moderate to fast
- Hardiness
- Protect from intense frost (warm temperate zones)
- Origin
- Australia (Victoria, New South Wales)
- Soil type
- Well-draining, slightly acidic, poor to moderately fertile
Care
Exposure and light
Banksia marginata thrives in full sun exposure, with at least 6 hours of direct daily sunlight. In very hot regions, afternoon partial shade protects it from scorching. Place it in an airy location to encourage good air circulation.
Watering
Water regularly during growth and flowering periods, keeping the soil moist but well-draining. Once established, reduce watering: Banksia marginata tolerates moderate drought. Avoid stagnant water, which causes root rot. In winter, reduce watering significantly.
Soil and drainage
Use very well-draining, slightly acidic soil that is poor in nutrients. A mix for Mediterranean or Australian plants, supplemented with coarse sand or gravel, works perfectly. Drainage is critical: elevate the pot or create a draining layer.
Pruning and shape
Prune lightly after flowering to stimulate branching and maintain a compact shape. Remove dead or diseased wood. Banksia marginata tolerates heavy pruning poorly: prefer gentle and regular interventions rather than hard cutting.
Fertilizing
Feed moderately in spring and early summer with balanced fertilizer or one formulated for Australian plants, low in phosphorus. Avoid overly rich fertilizers: Banksia is adapted to poor soils and excess nutrients can hinder flowering.
Problem prevention
Watch for root rot if watering is excessive. Lack of light or stagnant humidity promote fungal issues. Ensure good air circulation and respect watering cycles. Banksias are generally robust if growing conditions are met.
Did you know?
Banksia marginata owes its name to the characteristic serrated margins of its leaves. In Australia, its spectacular flower spikes attract nectar-feeding birds and insects, notably the honeyeater, playing a major ecological role. Australians appreciate these long-lasting flowers for floral arrangements: once cut, they keep for several weeks without water.
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.
Add this plant to my garden →Plants from the same family
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- Persoonia linearisPersoonia linearis
- Hairpin banksiaBanksia spinulosa
Tips generated and checked by Viridia — adapt them to your local climate.