Southern Sweetgrass Plant Care
Hierochloe australis Roem. & Schult.
Updated · Sources · How we source care data
Hierochloe australis is a species of flowering plant belonging to the family Poaceae.
Every 7–14 days
Full sun to partial shade
50–80°F
40–70%
At a glance
How do you care for Southern Sweetgrass?
Water Southern Sweetgrass every 7–14 days, letting the top layer of soil dry out between waterings, and give it full sun to partial shade. It prefers temperatures of 50–80°F (10–27°C) and 40–70% humidity. Fertilize it every 8 months during the growing season.
What Is the Southern Sweetgrass?
Southern Sweetgrass (Hierochloe australis) belongs to the Poaceae family within the Hierochloe genus.
Southern Sweetgrass displays a clumping perennial grass growth habit, reaching up to 2 ft tall with a spread of approximately 1.5 ft. Southern Sweetgrass produces small, inconspicuous flowers on slender spikes.
Leaf size: approximately 12 inches.
How Often Should You Water a Southern Sweetgrass?
Hierochloe australis requires watering every 7–14 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 7–14 days
Let soil partially dry between waterings
What Light Does the Southern Sweetgrass Need?
Southern Sweetgrass thrives in full sun to partial shade.
Light Requirement
Full sun to partial shade
What Temperature and Humidity Does the Southern Sweetgrass Prefer?
Hierochloe australis grows best at temperatures of 50–80°F. Southern Sweetgrass prefers humidity levels of 40–70%.
Temperature
50–80°F
Humidity
40–70%
What Soil Mix Works Best for a Southern Sweetgrass?
Well-draining loamy soil with high organic content. Good drainage is essential for Southern Sweetgrass to prevent waterlogging, which leads to root rot and fungal issues.
How Often Should You Fertilize a Southern Sweetgrass?
Feed Southern Sweetgrass every 8 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 8 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 Southern Sweetgrass?
Divide and repot every 2-3 years in early 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 Southern Sweetgrass?
Southern Sweetgrass can be propagated through division, seeds. Similar propagation techniques also apply to sweetgrass plant care, which shares the same genus.
Is the Southern Sweetgrass Toxic to Pets and Children?
Pet safety not verified
The ASPCA does not list Southern Sweetgrass, 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 Southern Sweetgrass?
Southern Sweetgrass is susceptible to aphids, grasshoppers, cutworms. 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 Southern Sweetgrass Need?
Southern Sweetgrass grows outdoors in USDA Zone 12a. It survives winters down to planting zone 12a. In cooler regions, grow Southern Sweetgrass as a houseplant or bring it indoors before the first frost.
Hardiness Zone
Zone 12a
Keep exploring plants
Southern Sweetgrass 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 Hierochloe genus — compare its care with other Hierochloe species on PlantoScan.
Hierochloe is part of the Poaceae plant family — browse all Poaceae genera and species.
Southern Sweetgrass thrives in bright light and direct sun — see other bright-light plants.
Related Plant Care Guides
Closely related plants with similar care requirements:
Sources
- Scientific name & taxonomy: Hierochloe australis Roem. & Schult., family Poaceae (first published in Syst. Veg., ed. 15 bis 2: 514 (1817)) — World Flora Online record, IPNI name record.
- Pet toxicity: Pet safety not verified: the ASPCA does not list Southern Sweetgrass, 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.
- Hardiness zone: USDA Zone 12a, calculated from the plant's minimum temperature.
- 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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