Is this a good garden plant?

Generally no, as it is considered an aggressive weed that is difficult to remove once established.

How do I get rid of it?

Pull the plants by hand before they produce the prickly burs, ensuring you remove the entire root system.

Plant guide

Sandbur.

Cenchrus echinatus

Pronounced SEN-krus ek-in-AY-tus

Also known as Burrgrass, Mossman River grass, Southern Sandbur, Spiny Sandbur, bur grass, burgrass

Cenchrus echinatus — Photo by Damien Wallace (CC0) via gbif

The southern sandbur is a hardy annual grass known for its prickly, burr like seed heads. It thrives in sandy, disturbed soils and is often found in coastal areas or pastures. While it can be a nuisance due to its sharp burs, it is a native species in many warm regions.

At a glance

Care level: Easy
Plant type: Annual grass
Light: Full sun
Indoor light: Direct sun
Water: Every 7 to 14 days
Mature size: 60 cm
Growth rate: Fast
Hardiness: USDA 8 to 11
Bloom time: Summer to autumn

Care

This plant requires very little attention as it is a resilient weed. Watch for the development of burs, which can be painful to touch or step on. It prefers dry, sandy conditions and will spread quickly if left unchecked.

Watering: Allow the soil to dry out completely between waterings.
Feeding: Rarely needs fertilizer, but a light application in spring can support growth.
Pruning: Remove seed heads before they mature to prevent unwanted spreading.
Repotting: Repot only if the plant becomes root bound in a container.
Soil: Sandy, well-draining soil
Soil pH: Neutral to slightly acidic
Temperature: 5 to 35°C
Humidity: 30 to 70%
Drought tolerance: High
Lifespan: Annual, typically 1 year
Deer and rabbits: High

Safety

People: There is no evidence of chemical toxicity, but the mechanical injury from the spines is a major concern.
Children: Keep children away from this plant because the sharp, prickly burs can cause painful injuries if handled or stepped on.
Contact allergens: The sharp, stiff spines can cause painful skin punctures and irritation upon contact.
Airborne allergens: The pollen may cause mild respiratory irritation in sensitive individuals.
Edibility: This plant is not considered edible and the sharp burs pose a significant risk to the mouth and digestive tract of humans and animals.

How to identify it

Sharp, spiny burrs in clusters
Flat, light green leaf blades
Spike like inflorescence
Tufted, spreading growth habit

Height: 0.2 to 0.6m
Spread: 0.2 to 0.5m
Leaves: green, deciduous
Flowers: green, straw, 0.5 to 1.5cm
Fruit: brown, Autumn

Problems to watch for

RustCommon
AphidsUncommon
SmutUncommon
DehydrationRare

By symptom

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Growing it

Propagation: seed
When to plant: spring
Overwintering: The plant dies back completely after the first frost, leaving only the seeds to survive in the soil until spring.
In containers: It is not recommended for containers due to its invasive nature and sharp spines.

Seed

Collect mature, brown burs in late autumn.
Store the burs in a dry, cool place over winter.
Sow the seeds directly into sandy soil in early spring.
Keep the soil lightly moist until germination occurs.

Avoid planting this near high traffic areas or pet zones to prevent injury from the burs.

Grows well with

Beach Sunflower · They share similar requirements for sandy, well drained soil.

Similar species

Field Sandbur · It is a very similar species that also produces painful, prickly burs.

Science

Family: Poaceae
Genus: Cenchrus
Order: Poales
Class: Liliopsida
Native range: Tropical and subtropical regions of the Americas.
Conservation: This plant is considered a widespread weed and is not of conservation concern.

It acts as a colonizer in disturbed, sandy environments, using its hooked seeds to hitchhike on passing animals.

Value to wildlife: provides cover for small insects
Pollinators: bees
Uses: ornamental in controlled settings, soil stabilization

Through the year

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Flowering

Fruiting

Foliage

Ecological indicators

Salinity: 4/9
Soil reaction: 6/9
Light: 8/9
Temperature: 7/9
Moisture: 3/9
Nutrients: 3/9

Taxonomy resolved against GBIF.

Questions people ask

Is this a good garden plant?: Generally no, as it is considered an aggressive weed that is difficult to remove once established.
How do I get rid of it?: Pull the plants by hand before they produce the prickly burs, ensuring you remove the entire root system.

Where the name comes from

The name Cenchrus comes from the Greek word for millet, while echinatus refers to the hedgehog like appearance of the prickly burs.

Good to know

It is commonly known as southern sandbur.
The burs are actually modified branches that surround the spikelets.
It thrives in sandy, disturbed soils where other plants struggle.

Also in

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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.