shrub

Silver Banksia

The Story

Plant Bio

Banksia marginata, the silver banksia, is an evergreen Australian shrub or small tree with narrow, leathery leaves that display a bright silver-white felted underside. The pale yellow flowers form dense, upright cylindrical spikes that stand conspicuously above the foliage from late summer through spring.

This species is highly adaptable to coastal conditions, showing strong tolerance to salt spray and maritime winds. The contrasting bicolored foliage and architectural cone-like blooms provide year-round structural interest in mild-climate gardens.

Uses & Benefits:

Distinctive bicolored foliage with silver undersides and large, architectural yellow flower spikes.

Excellent windbreak and soil stabilizer for coastal gardens with high salt exposure.

Provides nectar for generalist pollinators and shelter for small birds in mild climates.

Essentials

At a Glance

Plant Type

Shrub

Height

472"

Width

157"

Light

Full Sun, Partial Sun

Zones

9, 10

Water

Low to Medium

Humidity

Moderate

Lifespan

20-50 years

Native To

Australia

Toxicity

Non-toxic

Bloom period

Late summer – Spring

In flower about 10 months of the year

Planting

How to Grow

Select a planting site in full sun to partial shade with exceptionally well-drained, acidic to neutral soil.
Dig a hole twice as wide as the root ball but equal in depth, ensuring the plant sits level with the surrounding soil.
Water deeply during the establishment phase, then reduce irrigation to allow the soil to dry completely between waterings.
Apply a thick layer of organic mulch around the base, keeping it clear of the main stem to prevent collar rot.

Pro Tip

Never apply standard garden fertilizers; high phosphorus levels cause rapid, fatal toxicity in the specialized proteoid root system.

Keep It Thriving

Care Guide

Do

Grow in sandy, rocky, or highly porous soil to ensure rapid drainage.
Use only zero- or low-phosphorus fertilizers formulated specifically for native Australian plants.
Prune lightly immediately after flowering to maintain a dense, compact habit.

Don't

Do not prune hard into old, leafless brown wood, as the stems lack the buds required to regenerate.
Do not overwater or allow the roots to sit in stagnant, poorly drained soil.
Do not plant in areas with high, stagnant humidity and poor air circulation.

Seasonal Care Calendar

Task	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Fertilize
Mulch
Pest Check
Prune

Watch Out For

Pests & Diseases

Common Pests

Common Diseases

In the Garden

Landscape Uses & Companions

Landscape Uses

Coastal windbreaksSpecimen plantingArchitectural screensErosion control on sandy slopes

Companion Plants

Callistemon citrinus Grevillea robusta Adenanthos sericeus

Multiply

Propagation Methods

Good to Know

Common Questions

Silver Banksia questions

What zones can Silver Banksia grow in?

Silver Banksia is hardy in USDA Zones 9–10. Inside that range it survives winter in the ground; outside it, grow it as an annual or a container plant you protect.

Is Silver Banksia deer resistant?

Not reliably. Deer may browse Silver Banksia, especially tender spring growth — plan on repellents or fencing where pressure is high.

When does Silver Banksia bloom?

Silver Banksia typically blooms in late summer through spring. Exact timing shifts a week or two with your zone — Sow's bloom calendar maps it to your garden.

Does Silver Banksia need full sun?

Silver Banksia does best in full sun to part shade. In hot climates, afternoon shade keeps blooms fresher longer.

Is Silver Banksia drought tolerant?

Yes — once established (usually after the first full season), Silver Banksia handles dry spells with minimal watering. Water deeply its first year to build the root system that makes that possible.