Firewood banksia

Sun

Full sun; allow space around the crown for good air circulation.

Water

Water regularly while establishing, allowing the soil to drain between waterings. Once established, water deeply only during extended dry spells; avoid frequent shallow watering.

Soil

Deep, freely draining sand or sandy loam, preferably slightly acidic to neutral. Avoid waterlogged ground, heavy clay and phosphorus-rich soil amendments.

Height

16-33 ft (5-10 m), occasionally taller in favourable conditions

Spread

10-20 ft (3-6 m)

Flowers

Usually autumn to spring; in southwestern Australia, roughly February-October. Upright spikes open from silvery buds to pink or red flowers with cream or yellow tones; occasional plants have predominantly yellow flowers.

Foliage

Evergreen. Leathery, oblong leaves with conspicuous toothed edges, green above and paler beneath; new growth is often softly hairy.

Growth

Slow to moderate

Care needed

Medium

• Pollinators
• Drought tolerant
• Heat tolerant
• Wildlife
• Low allergen

Northern hemisphere months. In Australia, shift them by six.

Difficulty

Hard

Toughness

Needs looking after

Pick your zone, country, light and whether you have pets.

1. Planting day

   7 ft (2 m)

2. After 1 year

   7 ft (2.2 m)

3. After 2 years

   8 ft (2.4 m)

4. After 3 years

   9 ft (2.6 m)

5. After 5 years

   10 ft (3.1 m)

About 26 years to full size.

From a typical nursery size, at an average rate for this kind of plant. A rule of thumb, not a forecast.

Cats and dogs

Safe

Native to

Australia

Growth rate

Slow

• Plant in well-drained ground during mild weather; leave the root ball undisturbed as far as possible.
• Water deeply through the first two dry seasons, then reduce watering as roots establish.
• Do not use ordinary high-phosphorus fertilisers, manure or rich planting compost; use a low-phosphorus native-plant feed only if needed.
• Apply a thin layer of coarse mulch, keeping it clear of the trunk.
• Keep digging, paving and repeated foot traffic away from the root zone.

Pruning. After flowering, shorten selected leafy shoots lightly to encourage branching, leaving healthy foliage below each cut. Remove dead or damaged branches, but avoid routine hard pruning of mature trees.

Autumn

In mild, winter-rainfall climates, plant once the soil is moist but not saturated.

Winter

Check drainage after heavy rain and protect young plants from frost.

Spring

In frost-prone areas, plant only after frost risk has passed; check new growth for yellowing or dieback.

After flowering

Lightly shape young plants if necessary; retain some old flower spikes for their woody seed cones.

Early summer

Renew coarse mulch without covering the trunk base.

Summer

Deep-water young plants during dry weather; water established trees only during prolonged drought.

• Use as a specimen tree in a sunny, sandy garden, allowing room for its broad mature crown.
• Combine with kangaroo paws and grass trees for a layered Australian native planting.
• Place against a plain wall or open sky where the flower spikes and toothed foliage are easy to see.
• Include in a dry-climate wildlife garden, away from lawns that need frequent irrigation.

Garden styles it suits: Australian native, Wildlife garden, Mediterranean, Desert / xeriscape, Dry gravel garden and Architectural minimal.

Plant it with: Kangaroo paw, Geraldton wax, Woolly bush, Grass tree and Coastal rosemary.

Wildlife: Nectar attracts honeyeaters and other nectar-feeding birds in Australia, as well as insects. Cockatoos may open woody cones for seed, and a mature crown provides shelter for birds.

• Phytophthora root rot: decline and branch death are favoured by wet or contaminated soil. Prevent with excellent drainage, clean planting stock and careful watering; badly affected plants usually cannot be saved.
• Phosphorus toxicity: leaf-tip scorch and declining growth can follow unsuitable feeding. Stop phosphorus-rich fertilisers and manure, and seek soil testing before adding further nutrients.
• Iron chlorosis: young leaves may yellow in alkaline soil. Check soil pH and drainage; use an appropriate iron chelate if deficiency is confirmed.
• Frost damage: young shoots can blacken after freezing weather. Protect young plants and wait until spring growth begins before cutting back damaged wood.

Not known to be toxic to people, cats, dogs or horses. Species-specific information on ingestion is limited, so do not treat the leaves, flowers or seeds as food.

• Acorn banksia (Banksia prionotes)

  Its flower spikes open cream and turn orange, often producing a sharply two-coloured, acorn-like appearance; its leaves are generally longer and narrower.

• Baxter's banksia (Banksia baxteri)

  It has broad leaves with much deeper triangular lobes and rounded greenish-yellow flower heads rather than the typical pink-red spikes.

• Bull banksia (Banksia grandis)

  It has much larger, deeply divided leaves and long yellow flower spikes, rather than shallowly toothed leaves and pink-red flowers.

Banksia honours botanist Joseph Banks, menziesii honours naturalist Archibald Menzies, and the common name refers to the tree's historical use as firewood.

Propagation. Usually grown from seed released from mature woody cones. Sow in a clean, freely draining, low-phosphorus seed mix; smoke treatment is not normally necessary. Cuttings are possible but generally more difficult.

Accepted botanical name

Banksia menziesii

Native range

Western Australia.

Measured

Average height 400 cm.

Sources: GBIF (CC BY 4.0) and Trefle (CC BY 4.0). The care and design notes are LandscapeGPT's own.