Photo: Jacqui GeuxCC BY 4.0via iNaturalistresized / cropped
Hairy Saw-sedge Plant Care
Gahnia lacera Steud.
Updated · Sources · How we source care data
With long, razor-sharp leaves that resemble grass blades, this plant originates from Australia and New Zealand. Plant collectors are drawn to Gahnia lacera for its unique foliage and ability to add texture to gardens and landscapes.
Every 7–10 days
Full sun to part shade
60–80°F
40–70%
At a glance
How do you care for Hairy Saw-sedge?
Water Hairy Saw-sedge every 7–10 days, letting the top layer of soil dry out between waterings, and give it full sun to part shade. It prefers temperatures of 60–80°F (16–27°C) and 40–70% humidity. Fertilize it every 6 months during the growing season.
Where Is the Hairy Saw-sedge Native To?
What Is the Hairy Saw-sedge?
Hairy Saw-sedge (Gahnia lacera) belongs to the Cyperaceae family within the Gahnia genus. Hairy Saw-sedge is native to parts of the North Island of New Zealand.
Hairy Saw-sedge displays a grass-like clumping perennial growth habit, reaching up to 3 ft tall with a spread of approximately 2 ft. Hairy Saw-sedge produces inconspicuous small flowers on tall stems.
Leaf size: approximately 12 inches.
How Often Should You Water a Hairy Saw-sedge?
Gahnia lacera requires watering every 7–10 days. Allow the top layer of soil to dry between waterings to prevent root rot. Reduce watering frequency during winter when growth slows.
Watering Frequency
Every 7–10 days
Let soil partially dry between waterings
What Light Does the Hairy Saw-sedge Need?
Hairy Saw-sedge thrives in full sun to part shade.
Light Requirement
Full sun to part shade
What Temperature and Humidity Does the Hairy Saw-sedge Prefer?
Gahnia lacera grows best at temperatures of 60–80°F. Hairy Saw-sedge prefers humidity levels of 40–70%.
Temperature
60–80°F
Humidity
40–70%
What Soil Mix Works Best for a Hairy Saw-sedge?
Moist, well-draining soil with high organic content. Good drainage is essential for Hairy Saw-sedge to prevent waterlogging, which leads to root rot and fungal issues.
How Often Should You Fertilize a Hairy Saw-sedge?
Feed Hairy Saw-sedge every 6 months during the growing season (spring and summer) with a balanced fertilizer diluted to the strength on the label.
Pause feeding in autumn and winter, when growth slows, and never fertilize dry soil — water first.
Fertilizing
Every 6 months
During the growing season
The PlantoScan app can remind you when to water and when to fertilize each plant.
How Do You Repot a Hairy Saw-sedge?
Repot every 1-2 years in spring. Choose a pot one size larger than the current container, and ensure it has drainage holes to allow excess water to escape.
How Do You Propagate a Hairy Saw-sedge?
Hairy Saw-sedge can be propagated through division, seeds. Similar propagation techniques also apply to javan saw-sedge plant care, which shares the same genus.
Is the Hairy Saw-sedge Toxic to Pets and Children?
Pet safety not verified
The ASPCA does not list Hairy Saw-sedge, so we can't confirm whether it is safe for cats and dogs. Keep pets from chewing it as a precaution.
This is a general caution, not veterinary or medical advice. If your pet ate a plant, contact your vet or animal poison control.
See all plants toxic to cats and plants toxic to dogs.
What Pests and Diseases Affect the Hairy Saw-sedge?
Hairy Saw-sedge is susceptible to aphids, spider mites. Inspect the foliage regularly, especially along leaf undersides and stems. Treat infestations promptly with insecticidal soap or neem oil to prevent spread.
Yellow leaves, brown tips or drooping? See common plant problems and how to fix them.
What USDA Hardiness Zone Does the Hairy Saw-sedge Need?
Hairy Saw-sedge grows outdoors in USDA Zone 9a – 10b. It survives winters down to planting zone 9a. Hairy Saw-sedge is native to parts of the North Island of New Zealand. In cooler regions, grow Hairy Saw-sedge as a houseplant or bring it indoors before the first frost.
Hardiness Zone
Zone 9a – 10b
Keep exploring plants
Hairy Saw-sedge is one of many species covered in the complete plant care and identification guide, which groups plants by genus, attribute, and popularity.
It belongs to the Gahnia genus — compare its care with other Gahnia species on PlantoScan.
Gahnia is part of the Cyperaceae plant family — browse all Cyperaceae genera and species.
Hairy Saw-sedge thrives in bright light and direct sun — see other bright-light plants.
More Gahnia Species
Other Gahnia species in PlantoScan's care catalogue share similar watering, light, and soil preferences:
Sources
- Scientific name & taxonomy: Gahnia lacera Steud., family Cyperaceae (first published in Syn. Pl. Glumac. 2: 164 (1855)) — World Flora Online record, IPNI name record.
- Pet toxicity: Pet safety not verified: the ASPCA does not list Hairy Saw-sedge, so we can't confirm whether it is safe for cats and dogs. Checked against the ASPCA plant list; any other toxicity note on this page comes from PlantoScan's plant database.
- Photo: Jacqui Geux, CC BY 4.0, iNaturalist — original.
- Hardiness zone: USDA Zone 9a – 10b, estimated from the plant's typical growing conditions.
- Care values(watering, light, temperature, humidity, soil, fertilizing): PlantoScan's plant database, filtered by automatic plausibility checks — values that fail them are hidden. How we source and check plant data.
Spotted a mistake? Email info@upvision.media with the page link — we check and correct reported errors.
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