The Story
Plant Bio
Ptilotus exaltatus, commonly known as tall mulla mulla, is an erect, short-lived perennial native to the arid and semi-arid regions of mainland Australia. It develops a fleshy taproot and produces glaucous, blue-green, spatula-shaped leaves that decrease in size as they ascend the stiffly-branched stems.
The species is distinguished by its dense, cylindrical terminal spikes of feathery, tubular pink-to-purple flowers that feature distinctive silvery tips. These prominent inflorescences can reach up to 150 millimetres in length and persist from winter through to the end of summer.
Uses & Benefits:
Essentials
At a Glance
Plant Type
Perennial
Height
48 inches
Width
30 inches
Light
Full Sun
Zones
9, 10
Water
Low
Humidity
Low
Lifespan
Short-lived perennial
Native To
Australia
Toxicity
Non-toxic
Bloom period
Winter – Summer
In flower about 7 months of the year
Planting
How to Grow
- Select a planting site in full sun with exceptionally well-drained sandy or gravelly soil.
- Dig a hole twice the width of the pot but of equal depth to ensure the stem neck remains completely above the soil line.
- Gently backfill with native soil, avoiding any organic mulch or soil contact with the crown of the plant.
- Water sparingly to settle the soil, then withhold irrigation until the root system establishes.
Pro Tip
Keep the stem neck completely free of soil and mulch to prevent fungal crown rot, and avoid cutting back into old, leafless wood as the plant cannot regenerate from woody tissue.
Keep It Thriving
Care Guide
Do
- Plant in a position that receives maximum daily solar exposure.
- Ensure the soil drains rapidly to prevent waterlogging around the taproot.
- Deadhead spent flower spikes to prolong the flowering season.
- Apply a balanced, low-phosphorus or native-safe fertiliser sparingly during early growth.
Don't
- Do not bury the stem neck or apply heavy organic mulch against the crown.
- Do not overwater or plant in heavy, moisture-retaining clay soils.
- Do not prune heavily into old, leafless woody stems.
- Do not plant in highly humid coastal areas where fungal pathogens thrive.
Seasonal Care Calendar
| Task | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Deadhead | ||||||||||||
| Fertilize | ||||||||||||
| Pest Check | ||||||||||||
| Plant |
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
Tall Mulla Mulla questions
What zones can Tall Mulla Mulla grow in?
Tall Mulla Mulla is hardy in USDA Zones 9–10. Inside that range it survives winter in the ground; outside it, grow it as an annual or a container plant you protect.
When does Tall Mulla Mulla bloom?
Tall Mulla Mulla typically blooms in winter through summer. Exact timing shifts a week or two with your zone — Sow's bloom calendar maps it to your garden.
Does Tall Mulla Mulla need full sun?
Tall Mulla Mulla does best in full sun (6+ hours).
Is Tall Mulla Mulla drought tolerant?
Yes — once established (usually after the first full season), Tall Mulla Mulla handles dry spells with minimal watering. Water deeply its first year to build the root system that makes that possible.
Keep exploring
Explore the genus
Hardy in your zone?
Grow Tall Mulla Mulla 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.