Species · genus Acorus · Acoraceae

Slender Sweet Flag

Acorus gramineus Aiton

Also known as: Grass-leaf Sweet Flag · Grassleaf Sweet Flag · Grass-leaved Sweet-Flag · Grassleaf Sweetflag · Grassy-leaved Sweet Flag

Growth habit

perennial or rhizomatous geophyte

Native range

Bangladesh, Cambodia, China North-Central, China South-Central, China Southeast, East Himalaya, Hainan, Inner Mongolia, Japan, Korea, Laos, Myanmar, Philippines, Primorye, Qinghai, Taiwan, Thailand, Tibet, Vietnam, Xinjiang

Reference · A. gramineus

Cultivars of A. gramineus

The named forms growers keep — each with its own page, each honest about how much we know.

No named cultivars catalogued under A. gramineus yet. When growers document a stable, named form, it earns its own page here.

Guide

The species-level account. Cultivar pages build on this and say where they differ.

Acorus gramineus is a rhizomatous, grass-like perennial native to the wet margins of streams and marshes across temperate and subtropical Asia. Unlike most houseplants, it is a semi-aquatic wetland species that wants consistently damp soil and dislikes drying out; keep the mix evenly moist and water when the surface just begins to feel less than wet. Give it bright indirect light and steady humidity, and avoid letting it sit in cold, stagnant conditions.

Care recipe

The species record — the baseline every cultivar inherits unless it says otherwise.

Care notes are early — not yet verified

Light: ai:claude-opus-4-8
Water: ai:claude-opus-4-8 (range 3-7d)
Humidity: ai:claude-opus-4-8
Soil: ai:claude-fable-5
Care: ai:claude-fable-5

Light

Bright, indirect

Water

≈ every 7 days

Humidity

High

Temperature

10–24 °C

Soil mix

Constantly moist, water-retentive mix

Propagation

Clump division of the rhizomes

Fertilizing

Light monthly feed in the growing season

Growth rate

Slow

Flowering

Rarely flowers indoors

ToxicityAuthoritative · species

Not yet documented

This is where toxicity lives — every cultivar of this species inherits it and none can override it.

Reference images

Every image credited. Licenses link to their deeds.

No reference gallery yet

A few clear photos — habit, a mature leaf, a flower if it blooms — would give this page its eyes.

Add images

Sources: ai:claude-opus-4-8 · ai:claude-opus-4-8 (range 3-7d) · ai:claude-fable-5

Kept true by its growers

Every fact here carries its source. Grow Slender Sweet Flag yourself? What you’ve observed — how it drinks, how it holds its color, a name that’s off — is exactly what keeps this page honest. Contributions are reviewed before anything changes.