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Horsetail Tree

Casuarina equisetifolia

The Story

Plant Bio

Casuarina equisetifolia is a fast-growing, upright evergreen tree distinguished by its slender, drooping, jointed green branchlets that mimic pine needles. Native to coastal regions of Asia, Australia, and the Pacific, it develops an open, pyramidal crown and thrives in harsh, salt-laden maritime environments.

The species features tiny, scale-like leaves arranged in whorls at the nodes of its photosynthetic branchlets rather than true foliage. It possesses nitrogen-fixing root nodules containing Frankia bacteria, allowing it to colonize and stabilize barren, nutrient-poor sandy dunes.

Uses & Benefits:

Provides a unique, fine-textured silhouette with weeping, pine-like branchlets that whistle in the wind.

Serves as an exceptionally salt-tolerant windbreak and stabilizes shifting sand dunes along exposed coastlines.

Fixes atmospheric nitrogen to enrich poor soils and provides roosting and nesting cover for coastal bird species.

Essentials

At a Glance

Plant Type

Tree

Height

1181"

Width

590"

Light

Full Sun

Zones

9, 10

Water

Low

Humidity

High

Lifespan

Long

Native To

Asia, Oceania, Australia

Toxicity

Non-toxic

Bloom period

Spring – Summer

In flower about 6 months of the year

Planting

How to Grow

Select a planting site in full sun with exceptionally well-drained sandy or calcareous soil.
Dig a hole twice the width of the root ball and set the plant at the same depth as its nursery container.
Water deeply to settle the soil around the roots, then withhold supplemental watering once the root system is established.
Allow fallen branchlets to accumulate naturally to suppress weeds, or clear them if understory growth is desired.

Pro Tip

Avoid pruning back into old, leafless brown wood, as the tree lacks dormant buds on mature stems and will not regenerate.

Keep It Thriving

Care Guide

Do

Plant in loose, sandy, or gravelly soils that drain rapidly.
Allow the soil to dry out completely between waterings once established.
Prune exclusively to remove dead, damaged, or hazardous low-hanging limbs.

Don't

Do not apply nitrogen-rich fertilizers, as the root nodules fix their own nitrogen.
Do not shear or cut back into bare, woody branches.
Do not plant near sensitive native coastal ecosystems where it can become invasive.

Seasonal Care Calendar

Task	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Pest Check
Propagate
Prune
Winter Prep

Watch Out For

Pests & Diseases

Common Pests

Common Diseases

In the Garden

Landscape Uses & Companions

Landscape Uses

WindbreakErosion ControlCoastal StabilizationShade Tree

Companion Plants

Morella cerifera Coccoloba uvifera Uniola paniculata Ipomoea pes-caprae

Multiply

Propagation Methods

Good to Know

Common Questions

Horsetail Tree questions

What zones can Horsetail Tree grow in?

Horsetail Tree is hardy in USDA Zones 9–10. Inside that range it survives winter in the ground; outside it, grow it as an annual or a container plant you protect.

When does Horsetail Tree bloom?

Horsetail Tree typically blooms in spring through summer. Exact timing shifts a week or two with your zone — Sow's bloom calendar maps it to your garden.

Does Horsetail Tree need full sun?

Horsetail Tree does best in full sun (6+ hours).

Is Horsetail Tree drought tolerant?

Yes — once established (usually after the first full season), Horsetail Tree handles dry spells with minimal watering. Water deeply its first year to build the root system that makes that possible.