Cyperaceae
Round sawsedge
Gahnia aspera
Also known as Twig-rush, Sawsedge, Cladium, Lampocarya aspera
Zones 4–9Sun Partial SunWater ModerateCare Moderate
Tropical Plants · Native Plants · Sedge · Tropical · Clumping · Wildlife Food · Texture · Seed Heads · Pacific · Ornamental · Robust
Pet-safeTropicalAttracts pollinators
Currently out of stock everywhereStock updated 9/6/2026
Round sawsedge is a robust tropical sedge that forms attractive clumps with distinctive seed heads. It prefers consistently moist, well-draining soil and partial shade protection from intense sun. This plant adds excellent texture to tropical landscapes and provides food for wildlife through its seeds.
Growing conditions
The details behind the basics
- Daily light
- 4 hours
- Watering
- Keep soil consistently moist but well-draining · Every 7-10 days
- Maintenance
- Moderate
- Soil
- loam
- Soil pH
- 5.5–7.5
- Temperature
- -30°F to 95°F
- Cycle
- Perennial
- Propagation
- Seed
Hardiness
USDA 4a-9b
12345678910111213
Form & growth
Mature size and habit
- Mature height
- 12 in – 2.5 ft
- Spread
- 18 in
- Spacing
- 18 in apart
- Growth rate
- Moderate
- Root depth
- Medium
- Flowers
- No
- Foliage
- Fine
Ecology & origin
Where it belongs and what it brings
- Native to
- Cook Is., Fiji, Hawaii, Maluku, New Caledonia, New Guinea, New South Wales, Ogasawara-Shoto, Queensland, Society Is., Tubuai Is., Vanuatu, Wallis-Futuna Is.
- Attracts
- Birds
Sources: trefle
Buy this plant
No nurseries currently list it
No nursery lists Round sawsedge right now.