Sweet Flag Plant Care
Acorus calamus L.
Updated · Sources · How we source care data
Acorus calamus is a species of flowering plant with psychoactive chemicals. It is a tall wetland monocot of the family Acoraceae, in the genus Acorus.
Part shade to full sun
At a glance
How do you care for Sweet Flag?
Sweet Flag grows best in part shade to full sun.
What Is the Sweet Flag?
Sweet Flag (Acorus calamus) belongs to the Acoraceae family within the Acorus genus. Sweet Flag is also known as Calamus, Sweet Flag Root, Myrtle Grass.
Sweet Flag displays a grass-like perennial growth habit, reaching up to tall with a spread of approximately . Sweet Flag produces inconspicuous, small, greenish-yellow spadix.
What Light Does the Sweet Flag Need?
Sweet Flag thrives in part shade to full sun.
Light Requirement
Part shade to full sun
What Soil Mix Works Best for a Sweet Flag?
Rich, moist soil with good organic content. Good drainage is essential for Sweet Flag to prevent waterlogging, which leads to root rot and fungal issues.
How Do You Repot a Sweet Flag?
Divide and repot 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 Sweet Flag?
Sweet Flag can be propagated through division of rhizomes. Similar propagation techniques also apply to japanese sweet flag plant care, which shares the same genus.
Is the Sweet Flag Toxic to Pets and Children?
Pet safety not verified
The ASPCA does not list Sweet Flag, 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 Sweet Flag?
Sweet Flag 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.
Keep exploring plants
Sweet Flag 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 Acorus genus — compare its care with other Acorus species on PlantoScan.
Acorus is part of the Acoraceae plant family — browse all Acoraceae genera and species.
Sweet Flag 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: Acorus calamus L., family Acoraceae (first published in Sp. Pl. : 324 (1753)) — World Flora Online record, IPNI name record.
- Pet toxicity: Pet safety not verified: the ASPCA does not list Sweet Flag, 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.
- 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.
Identify Plants Like the
Sweet Flag Instantly
Scan any plant with your phone camera and get instant ID, care tips, water and fertilizer reminders, and health checks — all in one app.
Free
to download
iOS & Android
platforms
Light & dark
mode
100,000+
species