North America Non-native Plant

Gray Mallee

Botanical name: Eucalyptus morrisii

USDA symbol: EUMO9

Native status: Not native but doesn't reproduce and persist in the wild

Gray Mallee: A Rare Australian Beauty for Drought-Tolerant Gardens Meet the gray mallee (Eucalyptus morrisii), a charming and exceptionally rare eucalyptus that’s sure to turn heads in any drought-tolerant garden. This little-known gem hails from the rugged landscapes of South Australia and brings a unique combination of silvery foliage and ...

Gray Mallee: A Rare Australian Beauty for Drought-Tolerant Gardens

Meet the gray mallee (Eucalyptus morrisii), a charming and exceptionally rare eucalyptus that’s sure to turn heads in any drought-tolerant garden. This little-known gem hails from the rugged landscapes of South Australia and brings a unique combination of silvery foliage and delicate flowers that make it a standout choice for gardeners seeking something truly special.

What Makes Gray Mallee Special?

The gray mallee earns its common name from its distinctive gray-green leaves that shimmer beautifully in sunlight. This compact shrub typically grows 6-12 feet tall and wide, making it perfect for smaller landscapes where you want maximum impact without overwhelming the space. The cream-colored flowers appear in clusters, creating a lovely contrast against the silvery foliage and attracting beneficial pollinators to your garden.

Where Does It Come From?

Eucalyptus morrisii is endemic to South Australia, specifically found in the Flinders Ranges region. This limited native range makes it one of the rarer eucalyptus species, which is both exciting and important to consider before planting.

Important Conservation Note

Heads up, plant lovers! Gray mallee is considered a rare species due to its limited natural distribution. If you’re interested in growing this beauty, it’s crucial to source your plants responsibly from reputable nurseries that propagate from legally obtained seeds or cuttings. Never collect from wild populations, as this can harm already vulnerable native stands.

Growing Conditions and Care

The good news? Once you’ve sourced your gray mallee responsibly, it’s surprisingly easy to grow if you can meet its basic needs:

  • Sunlight: Full sun is essential for healthy growth and flowering
  • Soil: Well-draining soil is non-negotiable – this plant absolutely hates wet feet
  • Water: Drought tolerant once established, requiring minimal supplemental watering
  • Climate: Best suited for USDA hardiness zones 9-11

Planting and Care Tips

Getting your gray mallee off to a good start is pretty straightforward:

  • Plant in spring or fall when temperatures are moderate
  • Dig a hole twice as wide as the root ball but no deeper
  • Ensure excellent drainage by amending heavy soils with coarse sand or gravel
  • Water regularly the first year, then reduce to occasional deep watering
  • Prune lightly after flowering to maintain shape and encourage bushier growth

Perfect Garden Companions

Gray mallee shines in Mediterranean-style gardens, xerophytic landscapes, and Australian native plant collections. It pairs beautifully with other drought-tolerant plants like lavender, rosemary, and native grasses. Consider it as a specimen plant where its unique foliage and form can be appreciated up close.

Wildlife and Pollinator Benefits

The cream-colored flowers are a magnet for native bees and other beneficial insects, making this plant a valuable addition to pollinator gardens. The dense foliage also provides shelter for small birds and beneficial insects.

Should You Plant Gray Mallee?

If you live in a suitable climate zone and are passionate about rare, drought-tolerant plants, gray mallee could be a fantastic addition to your garden. However, remember that with great rarity comes great responsibility. Only purchase from reputable sources, and consider this plant an investment in conservation as much as garden beauty.

For gardeners in unsuitable climates or those seeking more readily available alternatives, consider other drought-tolerant eucalyptus species or native plants from your own region that offer similar aesthetic appeal and environmental benefits.

Gray Mallee

Classification

Group

Dicot

Kingdom

Plantae - Plants

Subkingdom

Tracheobionta - Vascular plants

Superdivision

Spermatophyta - Seed plants

Division

Magnoliophyta - Flowering plants

Subdivision
Class

Magnoliopsida - Dicotyledons

Subclass

Rosidae

Order

Myrtales

Family

Myrtaceae Juss. - Myrtle family

Genus

Eucalyptus L'Hér. - gum

Species

Eucalyptus morrisii R.T. Baker - gray mallee

Plant data source: USDA, NRCS 2025. The PLANTS Database. https://plants.usda.gov,. 2/25/2025. National Plant Data Team, Greensboro, NC USA