Photo: Humber AlbertoCC BY 4.0via iNaturalistresized / cropped
Flowering Oatgrass Plant Care
Trisetum floribundum Pilg.
Updated · Sources · How we source care data
<A brief description of the physical characteristics of "Trisetum floribundum">
Every 7–14 days
Full sun to partial shade
50–80°F
40–70%
At a glance
How do you care for Flowering Oatgrass?
Water Flowering Oatgrass 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.
Where Is the Flowering Oatgrass Native To?
What Is the Flowering Oatgrass?
Flowering Oatgrass (Trisetum floribundum) belongs to the Poaceae family within the Trisetum genus. Flowering Oatgrass is native to western South America. Flowering Oatgrass is also known as Large False Barley, Pacific False Barley.
Flowering Oatgrass displays an upright, tufted grass growth habit, reaching up to 3 ft tall with a spread of approximately 1.5 ft. Flowering Oatgrass produces small, inconspicuous flowers in terminal panicles.
Leaf size: approximately 12 inches.
How Often Should You Water a Flowering Oatgrass?
Trisetum floribundum 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 Flowering Oatgrass Need?
Flowering Oatgrass thrives in full sun to partial shade.
Light Requirement
Full sun to partial shade
What Temperature and Humidity Does the Flowering Oatgrass Prefer?
Trisetum floribundum grows best at temperatures of 50–80°F. Flowering Oatgrass prefers humidity levels of 40–70%.
Temperature
50–80°F
Humidity
40–70%
What Soil Mix Works Best for a Flowering Oatgrass?
Well-draining loamy soil with good organic content. Good drainage is essential for Flowering Oatgrass to prevent waterlogging, which leads to root rot and fungal issues.
How Often Should You Fertilize a Flowering Oatgrass?
Feed Flowering Oatgrass 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 Flowering Oatgrass?
Divide and replant clumps every 2-3 years. 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 Flowering Oatgrass?
Flowering Oatgrass can be propagated through seeds, division of clumps. Similar propagation techniques also apply to yellow oat grass plant care, which shares the same genus.
Is the Flowering Oatgrass Toxic to Pets and Children?
Pet safety not verified
The ASPCA does not list Flowering Oatgrass, 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 Flowering Oatgrass?
Flowering Oatgrass 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 Flowering Oatgrass Need?
Flowering Oatgrass grows outdoors in USDA Zone 12a. It survives winters down to planting zone 12a. Flowering Oatgrass is native to western South America. In cooler regions, grow Flowering Oatgrass as a houseplant or bring it indoors before the first frost.
Hardiness Zone
Zone 12a
Keep exploring plants
Flowering Oatgrass 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 Trisetum genus — compare its care with other Trisetum species on PlantoScan.
Trisetum is part of the Poaceae plant family — browse all Poaceae genera and species.
Flowering Oatgrass 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: Trisetum floribundum Pilg., family Poaceae (first published in Bot. Jahrb. Syst. 37: 505 (1906)) — World Flora Online record, IPNI name record.
- Pet toxicity: Pet safety not verified: the ASPCA does not list Flowering Oatgrass, 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: Humber Alberto, CC BY 4.0, iNaturalist — original.
- 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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