shrub

Myrtle Wattle

Acacia myrtifolia

The Story

Plant Bio

Acacia myrtifolia is an evergreen Australian shrub that forms a stiff, erect to spreading mound reaching up to ten feet in height. The alternate, leathery phyllodes resemble myrtle leaves and feature a prominent thickened margin.

New growth and angled branchlets display striking reddish or purplish tones that contrast with the pale yellow to cream flower heads. These small, globular flowers cluster in short axillary racemes throughout winter and spring.

Uses & Benefits:

Valued for its striking red stems, myrtle-like foliage, and bright yellow winter-to-spring floral display.

Serves as an effective windbreak or soil stabilizer in sandy, coastal, or low-nutrient soils.

Attracts generalist insect pollinators in North American gardens, though ecological interactions remain limited outside its native range.

Essentials

At a Glance

Plant Type

Shrub

Height

118"

Width

118"

Light

Full Sun, Partial Sun

Zones

9, 10

Water

Low

Humidity

Low to moderate

Lifespan

Moderate

Native To

Australia

Toxicity

Non-toxic

Bloom period

Winter – Spring

In flower about 6 months of the year

Planting

How to Grow

Select a planting site with full sun to light shade and highly permeable, low-nutrient sandy or gravelly soil.
Dig a hole twice as wide as the root ball but no deeper, ensuring the crown sits slightly above the surrounding soil level to prevent water pooling.
Water deeply but infrequently during the first summer to establish the root system, allowing the soil to dry out completely between waterings.
Apply a light layer of organic mulch around the base, keeping it several inches away from the stem to avoid moisture retention against the bark.

Pro Tip

Provide exceptional drainage in sandy or gravelly soil and completely avoid high-phosphorus fertilizers, which cause severe toxicity in this species.

Keep It Thriving

Care Guide

Do

Grow in highly porous, sandy, or gravelly soils to ensure rapid drainage.
Use only low-phosphorus, native-formulated fertilizers if feeding is necessary.
Lightly prune spent flower stems in late spring to maintain a compact shape.

Don't

Do not irrigate heavily during hot summer months, as warm, wet soil triggers fatal root rot.
Do not cut back into old, leafless wood, because the plant cannot regenerate from bare timber.
Do not plant in heavy clay or poorly drained soils.

Seasonal Care Calendar

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

Watch Out For

Pests & Diseases

Common Pests

Common Diseases

In the Garden

Landscape Uses & Companions

Landscape Uses

Coastal gardensLow-water bordersSpecimen plantingErosion control on sandy slopes

Companion Plants

Ceanothus thyrsiflorus Arctostaphylos densiflora Grevillea lanigera Westringia fruticosa

Multiply

Propagation Methods

Good to Know

Common Questions

Myrtle Wattle questions

What zones can Myrtle Wattle grow in?

Myrtle Wattle 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.

Is Myrtle Wattle deer resistant?

Not reliably. Deer may browse Myrtle Wattle, especially tender spring growth — plan on repellents or fencing where pressure is high.

When does Myrtle Wattle bloom?

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

Does Myrtle Wattle need full sun?

Myrtle Wattle does best in full sun to part shade. In hot climates, afternoon shade keeps blooms fresher longer.

Is Myrtle Wattle drought tolerant?

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