The Story
Plant Bio
Ficinia nodosa, commonly known as knobby club-rush, is a tough, rhizomatous perennial sedge native to coastal and inland southern Australia. It forms dense, arching tufts of upright, cylindrical green stems arising from a stout creeping rhizome, with leaves reduced to inconspicuous basal sheaths.
The species is distinguished by its globose, brownish-orange seed heads that cluster tightly just below the sharp-pointed tips of the stems. These decorative, spherical inflorescences persist year-round, providing structural interest and food for local seed-eating fauna.
Uses & Benefits:
Essentials
At a Glance
Plant Type
Grass
Height
39 inches
Width
79 inches
Light
Full Sun, Partial Sun
Zones
9, 10
Water
Low to high
Humidity
High tolerance
Lifespan
Perennial
Native To
Australia
Toxicity
Non-toxic but has sharp bracts
Bloom period
Spring – Summer
In flower about 4 months of the year
Planting
How to Grow
- Select a site in full sun to partial shade with well-draining sand, loam, or gravelly soil.
- Dig a hole twice the width of the root ball and of equal depth.
- Position the plant so the crown sits level with the surrounding soil, then backfill and firm down gently.
- Water thoroughly upon planting and maintain consistent moisture until the root system is established.
Pro Tip
Never shear this sedge flat to the ground like a turf grass; cutting hard into the old, leafless basal wood prevents new culms from shooting and can kill the clump.
Keep It Thriving
Care Guide
Do
- Trim back dead or untidy culms individually at the base.
- Plant in rain gardens or wet depressions to manage excess runoff.
- Use protective gloves when handling mature clumps to avoid pricks from the sharp bracts.
Don't
- Do not shear the plant flat to the ground like a lawn grass.
- Do not apply heavy chemical fertilisers, especially those high in phosphorus.
- Do not plant in deep, heavy shade where stems will become weak and floppy.
Seasonal Care Calendar
| Task | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Divide | ||||||||||||
| Fertilize | ||||||||||||
| Pest Check | ||||||||||||
| 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
Knobby Club-rush, Knotted Club-rush, Knobby Club Grass questions
What zones can Knobby Club-rush, Knotted Club-rush, Knobby Club Grass grow in?
Knobby Club-rush, Knotted Club-rush, Knobby Club Grass 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 Knobby Club-rush, Knotted Club-rush, Knobby Club Grass bloom?
Knobby Club-rush, Knotted Club-rush, Knobby Club Grass 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 Knobby Club-rush, Knotted Club-rush, Knobby Club Grass need full sun?
Knobby Club-rush, Knotted Club-rush, Knobby Club Grass does best in full sun to part shade. In hot climates, afternoon shade keeps blooms fresher longer.
Is Knobby Club-rush, Knotted Club-rush, Knobby Club Grass drought tolerant?
Yes — once established (usually after the first full season), Knobby Club-rush, Knotted Club-rush, Knobby Club Grass 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 Knobby Club-rush, Knotted Club-rush, Knobby Club Grass 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.