Eremophila macdonnellii Simpson Desert Form is a compact inland emu bush with brilliant deep purple tubular flowers and variable greyish to bright green foliage. This form is associated with the red sand dune country of Central Australia and the Simpson Desert, where it grows in harsh, open desert conditions. Eremophila macdonnellii – Simpson Desert form is a dense shrub to up to 50 cm high and up to 1 m wide, with foliage varying from greyish to bright green depending on the amount of hair on the leaves.
This is a superb plant for dry native gardens, gravel gardens, rockeries, large pots, and semi-arid landscapes. Its compact habit makes it easier to place than some broader forms of the species, while the intense purple flowers provide dramatic colour against red soil, gravel, stone, or silver-leaved companion plants.
Eremophila macdonnellii is a widespread Central Australian species, occurring through desert and dry shrubland regions. It is highly variable, with several forms in cultivation, including prostrate, pink-flowered, small-leaved, bright green-foliaged, and grey-foliaged forms. The Simpson Desert form is especially valued for its compact size, desert hardiness, and vivid flower colour.
Flowers
• Brilliant deep purple to violet-purple tubular flowers.
• Flowers may appear after rain or watering, with flowering often strongest through the cooler and milder months.
• The tubular blooms are rich in nectar and attractive to honeyeaters, native bees, butterflies, and other pollinators.
• The intense colour makes this one of the most striking small Eremophila forms for dry gardens.
Foliage
• Foliage may be greyish, silvery, or bright green, depending on leaf hairiness and growing conditions.
• Leaves are small and adapted to dry desert conditions.
• Dense, compact growth gives the plant a rounded, low shrub habit.
• Excellent contrast plant for gravel gardens, rockeries, and arid-style native plantings.
Cultivation
Soil:
Requires excellent drainage. Best suited to sandy, gravelly, rocky, or red desert-style soils. The broader species is known to tolerate clay, loam, sand, lime, and alkaline soils where drainage is suitable.
Sunlight:
Best grown in full sun. A hot, open position encourages compact growth and strong flowering.
Watering:
Water regularly while establishing. Once established, it needs very little supplementary water. Occasional deep watering during very long dry periods may encourage flowering and maintain foliage quality.
Frost tolerance:
Moderately frost hardy once established. State Flora / Botanic Gardens of South Australia plant data lists the broader species as tolerating moderate frost.
Drought tolerance:
Highly drought tolerant once established and well suited to arid, semi-arid, and low-rainfall gardens. The broader species is recorded as drought tolerant and requiring minimal supplementary watering once established.
Pruning:
Tip-prune lightly after flowering to maintain density and encourage a rounded shape. Avoid heavy pruning into old wood unless necessary.
Fertiliser:
Use a low-phosphorus native fertiliser sparingly in spring if required. Avoid overwatering or rich, wet soils.
Uses
• Compact feature shrub for dry native gardens and desert-style landscapes.
• Excellent for rockeries, gravel gardens, raised beds, and red-earth plantings.
• Suitable for large pots and containers, especially where drainage can be controlled.
• Useful in semi-arid, inland, waterwise, and low-maintenance gardens.
• Provides strong colour contrast with deep purple flowers and variable grey-green foliage.
• Good companion for other dryland natives such as Maireana, Rhagodia, Ptilotus, Eremophila, Scaevola, and native grasses.
Habitat Value
Eremophila macdonnellii – Simpson Desert Form is highly valuable in dry-climate habitat gardens. Its tubular flowers provide nectar for honeyeaters, native bees, butterflies, and other beneficial insects, while its dense low structure gives shelter to small invertebrates and ground-dwelling fauna.
In arid and semi-arid plantings, it contributes both nectar resources and protective cover, helping create resilient habitat layers beneath taller shrubs and small trees. Its ability to thrive with minimal water makes it particularly useful for habitat reconstruction in dry landscapes.
Growing Tips
Plant in a hot, sunny, sharply drained position. This plant dislikes wet feet, especially in humid climates or heavy soil. Raised beds, gravel mounds, sandy soils, and large containers are ideal.
Water through the first summer to establish roots, then reduce watering significantly. In pots, use a free-draining native potting mix and avoid saucers that hold water.
The Simpson Desert form is especially effective in gravel gardens and arid-style plantings, where its compact form, desert foliage, and deep purple flowers can be shown to best advantage. In humid or higher-rainfall areas, careful drainage and airflow are essential.
Conservation & Distribution Note
Eremophila macdonnellii is native to Australia and grows primarily in desert and dry shrubland biomes. The Simpson Desert form is specifically associated with Central Australian red sand dune country and the Simpson Desert, where it grows as a dense low shrub with brilliant purple flowers.
The species is not generally considered at risk in the wild and is widespread in Central Australia, but its many local forms are valuable in cultivation because they represent distinct regional adaptations.
