Mulga
Acacia aneura
A compact Australian tree with striking yellow rod-shaped blooms, ideal for small desert patios and tight spaces.
Hardy to roughly 18-20°F, suited to low and mid desert; a warm-climate Australian native that appreciates protection from hard frost while young.
AMWUA Notes
Drought tolerant once established; avoid frequent shallow watering, which produces weak growth.
Care Guide
Deep-soak weekly through the first summer to establish, then a deep soak every 2-3 weeks in summer heat and monthly in winter.
Needs little pruning; remove lower limbs to raise the canopy and thin lightly for shape in late winter after bloom.
No fertilizer needed; as a nitrogen-fixing acacia it makes its own in lean desert soil.
Largely pest-free in the desert.
Yellow rod-shaped flowers appear in spring; the gray-green phyllodes are evergreen year-round.
Soil, Feeding & Propagation
Deep, well-draining native, sandy, or decomposed-granite soil; tolerates caliche, rocky ground, and alkaline pH 7.5–8.5
Needs well-drained soil.
None — thrives in lean desert soil without fertilizer.
Grown from scarified seed; nursery-grown transplants establish readily in fall or spring
10–15 ft
Deep, non-aggressive roots; safe near pools, patios, and foundations at 6–8 ft
Placement Tips
- •Mature spread is only about 15 ft, so it fits narrow side yards and courtyards; space 10-12 ft from other trees.
- •Thornless with low litter, making it one of the safest small trees to plant within a few feet of pools, patios, and seating.
- •Stake and train to a single leader while young to develop a clean patio-tree canopy.
- •Site in full sun; tolerates reflected heat against west- and south-facing walls.
Features
Best Uses
Companion Plants
Quick Stats
Design Styles
Include in Your Project
Love Mulga? Our landscape team sources from wholesale nurseries and can incorporate it into your design.
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Use this care guide to maintain your Mulga. Questions about your landscape? Reach out anytime.
Data from 2024 AMWUA “Landscape Plants for the Arizona Desert” guide.
Mulga — common questions
Answers for low-desert Phoenix conditions, drawn from this plant’s growing data.
How much water does Mulga need in Phoenix?
Mulga is a low-water tree once established. Deep-soak weekly through the first summer to establish, then a deep soak every 2-3 weeks in summer heat and monthly in winter. Drought tolerant once established; avoid frequent shallow watering, which produces weak growth.
How big does Mulga get?
Expect roughly 20 ft tall and 15 ft wide at maturity, with a moderate growth rate. Allow about 10–15 ft of spacing when planting. Deep, non-aggressive roots; safe near pools, patios, and foundations at 6–8 ft.
Can you plant Mulga near a pool?
Yes. Mulga is considered pool-friendly, meaning it stays clean enough around water features and hardscape. Litter is rated low.
Can Mulga handle Arizona heat and winter frost?
Mulga is hardy in USDA 9-11 and wants full sun. Hardy to roughly 18-20°F, suited to low and mid desert; a warm-climate Australian native that appreciates protection from hard frost while young. Yellow rod-shaped flowers appear in spring; the gray-green phyllodes are evergreen year-round.
Does Mulga have thorns?
No. Mulga is thornless, so it is safe alongside walkways, patios and play areas.
Is Mulga safe around pets?
Mulga is listed as pet-friendly in this guide. If your dog is a determined chewer, check any new plant with your vet before planting.
When does Mulga bloom in Arizona?
Mulga blooms in spring, with yellow flowers.
How much maintenance does Mulga need?
Mulga is low-maintenance. Leaf, flower and pod litter is rated low. Needs little pruning; remove lower limbs to raise the canopy and thin lightly for shape in late winter after bloom.
What kind of soil does Mulga need?
Deep, well-draining native, sandy, or decomposed-granite soil; tolerates caliche, rocky ground, and alkaline pH 7.5–8.5. It needs no supplemental feeding. No fertilizer needed; as a nitrogen-fixing acacia it makes its own in lean desert soil.
Is Mulga native to Arizona?
No. Mulga is not an Arizona native; it originates from the Australia, but it is grown successfully in low-desert landscapes here.