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Plant guide

Boab.

Adansonia gregorii

Pronounced a-dan-SO-nee-a gre-GOR-ee-eye

Also known as Australian baobab, Boab, baobab, baobab bottletree, baobab-tree, bottletree, cream-of-tartar-tree, dead-rat-tree

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Adansonia gregorii
Photo by Martin Rady (CC BY) via gbif

The Boab is a fascinating tree native to Australia that is famous for its swollen, bottle shaped trunk. It stores water in its massive trunk to survive long periods of drought in its natural habitat. You will find it is a slow growing but long lived specimen that makes for a unique focal point.

Another photo of Boab
Photo by Wolfgang Ahlmer (CC BY) via iNaturalist

At a glance

Care level
Moderate
Plant type
Deciduous tree
Light
Full sun
Indoor light
Direct sun
Water
Every 7 to 21 days
Mature size
15 meters
Growth rate
Slow
Hardiness
USDA 10 to 12
Bloom time
Late spring to early summer

Care

Provide plenty of direct sunlight and ensure the soil drains very well to prevent root rot. Watch for soft or mushy stems which indicate too much moisture. Keep the plant dry during its winter dormancy period.

Watering
Water deeply during the growing season but allow the soil to dry out completely between waterings.
Feeding
Apply a balanced liquid fertilizer during the active growing season.
Pruning
Prune only to remove dead or crossing branches during the dormant season.
Repotting
Repot when the roots have filled the container, using a fast draining succulent mix.
Soil
Sandy, well draining soil
Soil pH
Neutral to slightly acidic
Temperature
5 to 45°C
Humidity
10 to 40%
Drought tolerance
High
Lifespan
Perennial, can live for centuries
Fragrance
Strong
Deer and rabbits
High

Signs it needs repotting

  • Roots growing out of the drainage holes
  • Water sitting on the surface for too long
  • Growth has stalled significantly

Safety

People
The plant is not considered toxic to humans.
Children
The large, heavy fruit pods can be a hazard if they fall, so keep children away from the base of the tree during fruiting.
Contact allergens
The fuzzy coating on the fruit can cause mild skin irritation if handled without gloves.
Airborne allergens
Pollen may cause mild reactions in sensitive individuals during the flowering season.
Edibility
The fruit pulp is edible, but seeds should not be consumed raw as they are very hard and may pose a dental risk.

How to identify it

  • Swollen bottle shaped trunk
  • Deciduous during dry season
  • Large white fragrant flowers
  • Hard woody fruit capsules
  • Palmately compound leaves
Height
5 to 15m
Spread
4 to 10m
Leaves
green, deciduous
Flowers
white, cream, 10 to 15cm
Fruit
brown, Late autumn

Problems to watch for

  • Root rot · Occurs when the soil remains too wet for extended periods.

Check your boab from a photo

Pocket Botanist looks at a photo of your plant and tells you what's wrong and what to try first.

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Growing it

Propagation
seed
When to plant
spring, early summer
Overwintering
Keep the plant completely dry and in a warm, frost-free location once it drops its leaves. Do not water until new growth appears in spring.
In containers
It grows well in large, deep containers with excellent drainage, though growth will be significantly slower than in the ground.

Seed

  1. 1. Scarify the hard seed coat with sandpaper.
  2. 2. Soak seeds in warm water for 24 hours.
  3. 3. Plant in a warm, sandy, well-draining medium.

Pair with other drought-tolerant Australian natives that require minimal soil disturbance.

Grows well with

  • Spinifex · These grasses thrive in the same arid, well-drained conditions as the Boab.

Similar species

  • African Baobab · It is a close relative but grows much larger and is native to Africa.

Science

Family
Malvaceae
Genus
Adansonia
Order
Malvales
Class
Magnoliopsida
Native range
Northwestern Australia
Conservation
It is not currently threatened, but wild collection of seeds should be done responsibly.

It survives in arid environments by shedding its leaves during the dry season to conserve moisture.

Value to wildlife
nectar source
Pollinators
bees, moths, beetles
Uses
ornamental specimen, traditional food source, shade tree

Through the year

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Flowering
Fruiting
Foliage

Ecological indicators

Salinity
2/9
Soil reaction
6/9
Light
9/9
Temperature
8/9
Moisture
2/9
Nutrients
3/9

Taxonomy resolved against GBIF.

Questions people ask

Can I grow a Boab in a pot?
Yes, it makes a striking bonsai or container plant if kept in a very sunny, well-draining spot.
How often should I water it?
Water sparingly during the growing season and keep it almost completely dry during its winter dormancy.

Where the name comes from

The genus honors the French botanist Michel Adanson, while the species name gregorii commemorates the Australian explorer Augustus Gregory.

Good to know

  • The trunk acts as a massive water reservoir during dry seasons.
  • Boabs can live for over a thousand years.
  • The flowers open at night to attract nocturnal pollinators.
  • Indigenous Australians have used the tree for food, water, and medicine for generations.

Also in

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This guide was generated with AI on and checked against GBIF taxonomy. It is general information, not horticultural or veterinary advice. Read about how we build these guides.