The Story
Plant Bio
Atriplex nummularia, commonly known as Old Man Saltbush, is an erect, long-lived woody perennial shrub native to the arid and temperate interior of mainland Australia. It forms a dense, branching framework that naturally colonises heavy clay flats, saline depressions, and swales between sand dunes.
This species is distinguished by its rounded, silvery-grey leaves covered in microscopic vesicular hairs that burst to create a glistening, mealy indumentum. Inconspicuous pale green to yellowish flowers appear in spring and summer, developing into flattened, papery fruiting bracteoles on female plants.
Uses & Benefits:
Essentials
At a Glance
Plant Type
Shrub
Height
118 inches
Width
118 inches
Light
Full Sun, Partial Sun
Zones
8, 9, 10
Water
Low
Humidity
Low to High
Lifespan
Perennial
Native To
Australia
Toxicity
Non-toxic
Bloom period
Spring – Summer
In flower about 4 months of the year
Planting
How to Grow
- Plant in a full sun position with well-drained soil to ensure optimal foliage density.
- Water moderately during the establishment phase, then reduce watering to rely on natural rainfall.
- Prune lightly and regularly to maintain a compact, rounded shape.
- Apply an occasional light application of balanced fertiliser only if the soil is extremely poor.
Pro Tip
Avoid heavy pruning during periods of extreme drought or wet weather; this disrupts the plant's transpiration-to-root moisture balance and can cause sudden dieback.
Keep It Thriving
Care Guide
Do
- Plant in a position that receives full sun.
- Ensure the soil has adequate drainage to prevent root rot.
- Pre-soak seeds overnight before sowing to remove salt inhibitors.
Don't
- Do not over-water or allow the plant to sit in waterlogged soil.
- Avoid heavy pruning during periods of extreme wet or dry weather.
- Do not over-manicure or fertilise excessively.
Seasonal Care Calendar
| Task | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Fertilize | ||||||||||||
| Pest Check | ||||||||||||
| Propagate | ||||||||||||
| Prune |
Watch Out For
Pests & Diseases
Common Pests
Common Diseases
In the Garden
Landscape Uses & Companions
Landscape Uses
Multiply
Propagation Methods
Good to Know
Common Questions
Old Man Saltbush, Giant Saltbush, Bluegreen Saltbush questions
What zones can Old Man Saltbush, Giant Saltbush, Bluegreen Saltbush grow in?
Old Man Saltbush, Giant Saltbush, Bluegreen Saltbush is hardy in USDA Zones 8–10. Inside that range it survives winter in the ground; outside it, grow it as an annual or a container plant you protect.
When does Old Man Saltbush, Giant Saltbush, Bluegreen Saltbush bloom?
Old Man Saltbush, Giant Saltbush, Bluegreen Saltbush 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 Old Man Saltbush, Giant Saltbush, Bluegreen Saltbush need full sun?
Old Man Saltbush, Giant Saltbush, Bluegreen Saltbush does best in full sun to part shade. In hot climates, afternoon shade keeps blooms fresher longer.
Is Old Man Saltbush, Giant Saltbush, Bluegreen Saltbush drought tolerant?
Yes — once established (usually after the first full season), Old Man Saltbush, Giant Saltbush, Bluegreen Saltbush handles dry spells with minimal watering. Water deeply its first year to build the root system that makes that possible.
More Atriplex to compare
Keep exploring
Explore the genus
Hardy in your zone?
Grow Old Man Saltbush, Giant Saltbush, Bluegreen Saltbush with confidence
See it in a design of your actual yard, get zone-matched care reminders, and track it season by season in your garden journal.