North America Non-native Plant

Mottlecah

Botanical name: Eucalyptus macrocarpa

USDA symbol: EUMA21

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

Mottlecah: The Show-Stopping Australian Native with Dinner-Plate Flowers If you’ve ever dreamed of having flowers the size of dinner plates in your garden, meet the mottlecah (Eucalyptus macrocarpa). This Australian native is like nature’s way of showing off – imagine bright red blooms that can stretch up to 4 inches ...

Mottlecah: The Show-Stopping Australian Native with Dinner-Plate Flowers

If you’ve ever dreamed of having flowers the size of dinner plates in your garden, meet the mottlecah (Eucalyptus macrocarpa). This Australian native is like nature’s way of showing off – imagine bright red blooms that can stretch up to 4 inches across, paired with some of the most distinctive foliage you’ll ever see. But before you start planning where to plant one, let’s dive into whether this botanical showstopper is right for your garden.

What Makes Mottlecah Special?

Mottlecah isn’t your typical backyard tree. This eucalyptus species grows as a sprawling shrub or small tree, typically reaching 6-15 feet tall and spreading even wider. What really sets it apart are those incredible silvery-blue leaves that wrap around the stems like nature’s own geometric art project, and those absolutely stunning red flowers that appear throughout much of the year.

Where Does Mottlecah Come From?

This beauty calls southwestern Western Australia home, where it thrives in the Mediterranean-like climate of the region. It’s perfectly adapted to hot, dry summers and mild, wet winters – which gives us some pretty big clues about how to keep it happy in our gardens.

The Good, The Bad, and The Spectacular

Let’s be honest about what you’re signing up for with mottlecah:

The Spectacular Stuff:

  • Those show-stopping red flowers that’ll have neighbors peeking over your fence
  • Unique silvery-blue foliage that looks good year-round
  • Extremely drought tolerant once established
  • Attracts nectar-loving birds and beneficial insects
  • Low maintenance once you get the growing conditions right

The Challenges:

  • Not cold-hardy – only suitable for USDA zones 9-11
  • Can be sensitive to overwatering and poor drainage
  • Takes up quite a bit of space with its sprawling habit
  • Not native to North America, so it won’t support local ecosystems as well as native plants

Growing Mottlecah Successfully

If you live in the right climate zone and want to give mottlecah a try, here’s how to set it up for success:

Location and Soil:

  • Choose a spot with full sun exposure
  • Ensure excellent drainage – this plant absolutely hates wet feet
  • Sandy or gravelly soils work best
  • Allow plenty of space for spreading (think 8-12 feet wide)

Planting and Early Care:

  • Plant in fall or early spring in mild climates
  • Water regularly the first year to help establish roots
  • Once established, reduce watering significantly
  • Avoid fertilizing – these plants prefer lean soils

Ongoing Maintenance:

  • Prune lightly after flowering to maintain shape
  • Watch for signs of overwatering (yellowing leaves, leaf drop)
  • Protect from hard frost in marginal zones

Is Mottlecah Right for Your Garden?

Mottlecah works best in drought-tolerant, Mediterranean-style landscapes where its unique beauty can really shine. It’s perfect for xerophytic gardens, as a specimen plant, or as part of a water-wise landscape design. However, since it’s not native to North America, consider whether native alternatives might better support your local wildlife and ecosystem.

If you’re in zones 9-11 and have the right conditions, mottlecah can be a stunning addition to your garden. Just remember that this is a plant that rewards patience and proper placement with years of spectacular blooms that’ll make your garden the talk of the neighborhood.

Supporting Local Ecosystems

While mottlecah is undeniably beautiful, don’t forget to consider native alternatives that provide similar aesthetic appeal while supporting local birds, butterflies, and other wildlife. Your local native plant society or extension office can suggest gorgeous native options that might work just as well in your specific location.

Mottlecah

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 macrocarpa Hook. - mottlecah

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