Can I grow this in a small garden?

No, it grows into a massive tree and is unsuitable for small spaces.

Is the sap dangerous?

Yes, it is highly toxic and can cause severe skin and eye damage.

Plant guide

Sandbox tree.

Hura crepitans

Pronounced HYOO-ruh kreh-pih-TAN-iss

Also known as Dynamite Tree, Sandbox tree, monkey-no-climb

The sandbox tree is a massive, semi-deciduous tropical tree known for its explosive seed pods. It is a striking specimen that requires plenty of space to grow. You should handle this tree with care because it has sharp spines on its trunk.

Another photo of Sandbox tree — Photo by sucker69420 (CC BY) via gbif

At a glance

Care level: Difficult
Plant type: Tropical tree
Light: Full sun
Indoor light: Direct sun
Water: Every 3 to 7 days
Mature size: 30 to 40 meters
Growth rate: Fast
Hardiness: USDA 10 to 12
Bloom time: Late spring to early summer

Care

Provide this tree with ample sunlight and consistent moisture in a spacious outdoor environment. Watch for yellowing leaves as a sign of poor drainage or nutrient deficiency. Keep pets away from the trunk to avoid contact with the caustic sap.

Watering: Keep the soil consistently moist but never waterlogged.
Feeding: Apply a balanced fertilizer during the active growing season.
Pruning: Prune only to remove dead or damaged branches for safety.
Repotting: Repot young trees into larger containers as they outgrow their current space.
Soil: Rich, moist, well draining soil
Soil pH: 6.0 to 7.5
Temperature: 15 to 35°C
Humidity: 60 to 90%
Drought tolerance: Low
Lifespan: Perennial, typically 50 to 100 years
Deer and rabbits: High

Signs it needs repotting

Roots growing out of drainage holes
Stunted growth despite proper care

Safety

People: The milky sap is extremely caustic and can cause severe skin irritation and blindness if it contacts the eyes.
Pets: The sap of this tree is highly toxic and can cause severe irritation to pets if ingested or touched.
Children: This tree is dangerous for children due to its sharp trunk spines and explosive, toxic fruit.
Contact allergens: The sap contains diterpene esters that cause painful blistering upon contact with skin.
Airborne allergens: The fine dust from dried wood or sap can irritate the respiratory tract.
Edibility: The seeds and sap are highly toxic and should never be consumed.

How to identify it

Large, glossy, heart shaped leaves
Sharp, conical spines on trunk
Explosive, pumpkin shaped fruit capsules
Stout, greyish brown bark

Height: 15 to 30m
Spread: 10 to 20m
Leaves: green, deciduous
Flowers: red, 2 to 5cm
Fruit: brown, Late summer to autumn

Problems to watch for

Stem BorersCommon
CankerUncommon
CaterpillarsUncommon
Leaf SpotUncommon
Root RotUncommon
Scale InsectsUncommon

By symptom

Plant problems by symptom

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Growing it

Propagation: seed
When to plant: Spring
Overwintering: Ensure the tree is kept in a frost free environment as it cannot tolerate cold temperatures. Keep the soil consistently moist but not waterlogged during the cooler months.
In containers: Not suitable for containers due to its massive size and aggressive root system.

Seed

1. Collect seeds from mature, unopened pods.
2. Plant seeds in a well draining, sandy potting mix.
3. Maintain high humidity and warmth above 25 Celsius.
4. Germination usually occurs within 3 to 6 weeks.

Plant only large, sturdy tropical shrubs beneath it to avoid damage from falling, exploding fruit.

Grows well with

Heliconia · These plants enjoy the same high humidity and dappled shade provided by the tree canopy.

Similar species

Rubber Tree · Both are members of the Euphorbiaceae family and produce milky sap.

Science

Family: Euphorbiaceae
Genus: Hura
Order: Malpighiales
Class: Magnoliopsida
Native range: Tropical regions of North and South America.
Conservation: Not currently of conservation concern.

It thrives in moist, tropical lowland forests where it competes for light in the canopy.

Value to wildlife: nectar source
Pollinators: bees, butterflies
Uses: ornamental shade tree, timber, traditional medicine

Through the year

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Flowering

Fruiting

Foliage

Ecological indicators

Salinity: 2/9
Soil reaction: 6/9
Light: 8/9
Temperature: 9/9
Moisture: 7/9
Nutrients: 6/9

Taxonomy resolved against GBIF.

Questions people ask

Can I grow this in a small garden?: No, it grows into a massive tree and is unsuitable for small spaces.
Is the sap dangerous?: Yes, it is highly toxic and can cause severe skin and eye damage.

Where the name comes from

The name crepitans refers to the rattling sound the seeds make inside the fruit before it explodes. Hura is the local name used by indigenous people in the Caribbean.

Good to know

The tree is often called the sandbox tree because the fruit was once used to make containers for sand used to dry ink.
The trunk is covered in sharp, conical spines that protect it from herbivores.
Seeds can be launched up to 45 meters away during the explosive dehiscence of the fruit.
The wood is sometimes used for furniture and is known as hura wood.

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This guide was generated with AI on September 26, 2026 and checked against GBIF taxonomy. It is general information, not horticultural or veterinary advice. Read about how we build these guides.