Bismarck palm

Sun

Full sun; tolerates light shade but develops its best colour and shape in strong light.

Water

Water regularly while establishing, allowing the surface soil to dry between soakings. Established palms tolerate drought, but grow better with occasional deep watering during prolonged dry weather.

Soil

Well-drained sandy, loamy or gravelly soil; tolerates a range of soil pH but not persistent waterlogging.

Height

40-60 ft (12-18 m)

Spread

15-25 ft (4.5-7.6 m)

Flowers

Small cream flowers on branching stalks among the leaves, usually in spring or summer in warm climates; male and female flowers grow on separate palms.

Foliage

Evergreen. Huge, stiff, rounded fan leaves, often 6 ft (1.8 m) across, divided into pointed segments. Most garden plants are silver-blue, although green-leaved forms also occur.

Growth

Slow initially, becoming moderate in sustained warmth with adequate water.

Care needed

Low

• Pollinators
• Drought tolerant
• Heat tolerant
• Wildlife

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

   8 ft (2.5 m)

3. After 2 years

   10 ft (3 m)

4. After 3 years

   11 ft (3.5 m)

5. After 5 years

   15 ft (4.5 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

Growth rate

Slow

• Choose the permanent position carefully, allowing room for the full crown away from buildings, overhead wires and paths.
• Plant during warm weather at the original soil depth, keeping the root ball intact; damaged roots can cause transplant failure.
• Water the root zone deeply during establishment, but do not leave the soil saturated.
• In warm growing conditions, apply a slow-release palm fertiliser containing potassium, magnesium and micronutrients at the label rate.
• Mulch over the root zone, keeping mulch away from the trunk.
• Protect young plants from frost; move containers into bright, frost-free shelter before cold weather.

Pruning. Remove only completely brown fronds and unwanted flower or fruit stalks, preferably during warm weather. Do not remove healthy green leaves, cut into the trunk or damage the central growing spear.

Spring

As local temperatures become consistently warm, plant new palms without disturbing their root balls.

Spring

Apply palm fertiliser if needed and renew mulch without covering the trunk base.

Summer

Deep-water establishing palms and check that water drains freely from containers.

Late summer

Inspect older leaves for nutrient-deficiency patterns and check the crown for unusual wilting or damage.

Autumn

In cooler climates, bring container plants into bright, heated shelter before frost.

Winter

Reduce watering as growth slows, while avoiding complete drying of container root balls.

• Use as a single focal tree in a large lawn or open gravel garden, leaving its symmetrical crown unobstructed.
• Pair with low agaves, aloes or ornamental grasses for contrasting leaf shapes in a warm, dry garden.
• Place against dark evergreen planting to emphasise the silver foliage.
• Use in spacious tropical or poolside planting, set well back from paving so mature leaves do not obstruct movement.

Garden styles it suits: Architectural minimal, Modern tropical, Desert modern, Luxury resort, Tropical and Desert / xeriscape.

Plant it with: Foxtail agave, Coral aloe, Coontie, Lomandra and Bird of paradise.

Wildlife: Flowers attract visiting insects, and ripe fruit may be eaten by local wildlife. Its wildlife value varies outside its native Madagascar.

• Root rot in poorly drained soil: improve drainage before planting and reduce watering if the soil remains wet.
• Potassium or magnesium deficiency, showing as spotting, yellowing or premature loss of older leaves: use an appropriate palm fertiliser and retain living fronds while the palm recovers.
• Palm weevils in regions where they occur: avoid unnecessary wounds and seek local professional advice promptly if the crown wilts, holes appear or fibres become chewed.
• Cold damage, especially on young or green-leaved plants: provide frost protection, keep damaged but partly green leaves, and wait for warm-weather regrowth before removing dead tissue.

Not known to be toxic to cats, dogs, horses or people, although species-specific toxicity information is limited. The fruits are not established as food for people or pets; large fruits can be a choking hazard, and stiff leaf tips can cause injury.

• Mexican blue palm (Brahea armata)

  Also has silver-blue fan leaves, but its leaves are smaller, its leaf stalks have conspicuous teeth, and mature plants produce long, arching flower sprays extending beyond the crown.

• Silver saw palmetto (Serenoa repens)

  Has much smaller fans and usually forms low, spreading clumps with creeping stems rather than one tall, substantial trunk; its leaf stalks have sharp saw-like teeth.

Bismarckia honours the German statesman Otto von Bismarck, while nobilis is Latin for noble.

Propagation. Grow from fresh seed in a deep container with steady warmth and a free-draining medium; germination can take several months. It does not produce offsets, and seeds require a fruiting female palm that has been pollinated by a male.

Accepted botanical name

Bismarckia nobilis

Native range

Madagascar.

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