Tall Oat Grass Plant Care
Arrhenatherum elatius (L.) P.Beauv. ex J.Presl & C.Presl
Updated · Sources · How we source care data
Arrhenatherum elatius is a species of flowering plant in the grass family Poaceae, commonly known as false oat-grass, and also bulbous oat grass, tall oat-grass, tall meadow oat, onion couch and tuber oat-grass. It is native throughout Europe, and also western and southwestern Asia, and northwestern Africa.
Every 7–14 days
Full sun to partial shade
50–85°F
40–70%
At a glance
How do you care for Tall Oat Grass?
Water Tall Oat Grass 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 50–85°F (10–29°C) and 40–70% humidity. Fertilize it every 8 months during the growing season.
What Is the Tall Oat Grass?
Tall Oat Grass (Arrhenatherum elatius) belongs to the Poaceae family within the Arrhenatherum genus. Tall Oat Grass is also known as Common Oat Grass, False Oat Grass, Meadow Oat Grass.
Tall Oat Grass displays an upright, clumping grass growth habit, reaching up to 2 ft tall with a spread of approximately 1.5 ft. Tall Oat Grass produces small, inconspicuous flowers in spikelets.
Leaf size: approximately 12 inches.
How Often Should You Water a Tall Oat Grass?
Arrhenatherum elatius 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 Tall Oat Grass Need?
Tall Oat Grass thrives in full sun to partial shade.
Light Requirement
Full sun to partial shade
What Temperature and Humidity Does the Tall Oat Grass Prefer?
Arrhenatherum elatius grows best at temperatures of 50–85°F. Tall Oat Grass prefers humidity levels of 40–70%.
Temperature
50–85°F
Humidity
40–70%
What Soil Mix Works Best for a Tall Oat Grass?
Well-draining loamy soil with good fertility. Good drainage is essential for Tall Oat Grass to prevent waterlogging, which leads to root rot and fungal issues.
How Often Should You Fertilize a Tall Oat Grass?
Feed Tall Oat Grass 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 Tall Oat Grass?
Divide clumps 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 Tall Oat Grass?
Tall Oat Grass can be propagated through division, seed.
Is the Tall Oat Grass Toxic to Pets and Children?
Pet safety not verified
The ASPCA does not list Tall Oat Grass, 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 Tall Oat Grass?
Tall Oat Grass 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 Tall Oat Grass Need?
Tall Oat Grass grows outdoors in USDA Zone 12a. It survives winters down to planting zone 12a. In cooler regions, grow Tall Oat Grass as a houseplant or bring it indoors before the first frost.
Hardiness Zone
Zone 12a
Keep exploring plants
Tall Oat Grass 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 Arrhenatherum genus — compare its care with other Arrhenatherum species on PlantoScan.
Arrhenatherum is part of the Poaceae plant family — browse all Poaceae genera and species.
Tall Oat Grass 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: Arrhenatherum elatius (L.) P.Beauv. ex J.Presl & C.Presl, family Poaceae (first published in Fl. Cech. : 17 (1819)) — World Flora Online record, IPNI name record.
- Pet toxicity: Pet safety not verified: the ASPCA does not list Tall Oat Grass, 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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