tree

Red Box

The Story

Plant Bio

Eucalyptus polyanthemos, commonly known as red box, is an evergreen Australian tree native to the tablelands and western slopes of New South Wales, Victoria, and the Australian Capital Territory. It develops a short, often crooked trunk and a dense, rounded canopy, with fibrous, flaky bark on the lower trunk that transitions to smooth grey, cream, or yellow bark above.

This species is distinguished by its highly glaucous, blue-grey juvenile foliage, which is distinctly rounded and popular in floral arrangements. As the tree matures, the canopy leaves transition to a dull grey-green, lanceolate or ovate form.

Uses & Benefits:

Provides year-round structural interest with its distinctive rounded blue-grey juvenile foliage and smooth, multi-toned upper bark.

Functions as an effective windbreak or shade tree in dry, low-nutrient soils where other species struggle.

Supports native bees, nectar-eating birds, and specialized caterpillars like the long-tailed bombyx with heavy nectar and foliage.

Essentials

At a Glance

Plant Type

Tree

Height

590 inches

Width

394 inches

Light

Full Sun

Zones

8, 9, 10

Water

Low

Humidity

Moderate

Lifespan

Long

Native To

Eastern Australia

Toxicity

Non-toxic

Bloom period

Spring – Summer

In flower about 4 months of the year

Planting

How to Grow

Select a planting site in full sun with deep, well-drained sandy loam or gravelly soil.
Dig a hole twice the width of the root ball but of equal depth to prevent the trunk settling too deep.
Gently backfill with native soil without adding fertilisers or organic soil conditioners.
Water thoroughly to settle the soil and maintain regular moisture only during the first two summers.

Pro Tip

Plant in free-draining, low-nutrient soil on a slope or elevated site, as waterlogging or heavy, wet clay at the root zone causes fatal root rot.

Keep It Thriving

Care Guide

Do

Prune young trees formatively to establish a strong, straight central leader.
Clear fallen gumnuts from adjacent paved pathways to eliminate slip hazards.
Ensure excellent air circulation around the canopy to prevent fungal issues.

Don't

Do not prune hard into old, leafless bare wood, as the tree lacks responsive epicormic buds on old timber.
Do not apply heavy doses of phosphorus-rich fertilisers.
Do not plant in low-lying areas prone to standing water or waterlogging.

Seasonal Care Calendar

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

Watch Out For

Pests & Diseases

Common Pests

Common Diseases

In the Garden

Landscape Uses & Companions

Landscape Uses

Specimen treeWindbreakShade treeFoliage harvest

Companion Plants

Westringia fruticosa Acacia pycnantha Grevillea lanigera

Multiply

Propagation Methods

Good to Know

Common Questions

Red Box questions

What zones can Red Box grow in?

Red Box is hardy in USDA Zones 8–10. Inside that range it survives winter in the ground; outside it, grow it as an annual or a container plant you protect.

When does Red Box bloom?

Red Box 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 Red Box need full sun?

Red Box does best in full sun (6+ hours).

Is Red Box drought tolerant?

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