shrub

Mottlecah

The Story

Plant Bio

Eucalyptus macrocarpa, commonly known as mottlecah, is a sprawling, multi-stemmed evergreen shrub native to Western Australia, characterized by its distinctive powdery, silvery-white, heart-shaped leaves that clasp the stems. The plant produces massive, solitary crimson-red flowers up to four inches across, composed of dense clusters of yellow-tipped stamens emerging from large, woody, conical buds.

This species is distinguished by having the largest flowers of any eucalyptus, which contrast sharply against the intensely glaucous, blue-grey foliage. The sprawling, haphazard growth habit arises from a woody underground lignotuber, allowing the plant to regenerate if cut back completely.

Uses & Benefits:

Bold, silvery-white foliage and massive crimson-red flowers provide dramatic architectural interest.

Highly drought-tolerant once established, requiring virtually no supplemental summer irrigation.

Nectar-rich flowers provide an abundant food source for hummingbirds and beneficial insects.

Essentials

At a Glance

Plant Type

Shrub

Height

120"

Width

150"

Light

Full Sun

Zones

9, 10

Water

Low

Humidity

Low

Lifespan

Long-lived

Native To

Western Australia

Toxicity

Mildly toxic if ingested

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-draining sandy, gravelly, or loam 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 immediately after planting to settle the soil, then restrict irrigation to occasional deep watering during the first dry season only.
Refrain from applying any fertilizer, particularly high-phosphorus formulations, which can damage or kill the sensitive root system.

Pro Tip

Avoid regular summer irrigation and heavy soils, as excess moisture rapidly triggers fatal Phytophthora root rot in this desert-adapted species.

Keep It Thriving

Care Guide

Do

Plant in exceptionally well-draining sandy or gravelly soil.
Provide a position in full sun with excellent air circulation.
Prune lightly after flowering to manage structural weight and prevent branch breakage.

Don't

Do not overwater or plant in heavy, poorly drained clay soils.
Do not apply high-phosphorus fertilizers.
Do not shear the plant into a tight hedge or cut back heavily into old, leafless wood.

Seasonal Care Calendar

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

Watch Out For

Pests & Diseases

Common Pests

Common Diseases

In the Garden

Landscape Uses & Companions

Landscape Uses

Specimen PlantMediterranean GardenXeriscapingCoastal Garden

Companion Plants

Salvia apiana Arctostaphylos Ceanothus Romneya coulteri

Multiply

Propagation Methods

Good to Know

Common Questions

Mottlecah questions

What zones can Mottlecah grow in?

Mottlecah 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 Mottlecah deer resistant?

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

When does Mottlecah bloom?

Mottlecah 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 Mottlecah need full sun?

Mottlecah does best in full sun (6+ hours).

Is Mottlecah drought tolerant?

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