Species · genus Acorus · Acoraceae

Calamus

Acorus calamus L.

Also known as: Common Sweet Flag · Myrtle Flag · Flagroot · Sweet Calamus · Sweet Flag

Growth habit

perennial or rhizomatous geophyte

Native range

Kazakhstan

Reference · A. calamus

Cultivars of A. calamus

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

No named cultivars catalogued under A. calamus 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 calamus is a rhizomatous marginal wetland perennial from temperate Eurasia, growing along the edges of ponds and slow water. Unlike most houseplants it tolerates and prefers consistently wet, boggy soil that should not dry out fully; water when the surface begins to feel less than saturated, keeping the mix evenly moist. Give it bright light and high humidity, the conditions of its open wetland habitat.

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 2-5d)
Humidity: ai:claude-opus-4-8
Soil: ai:claude-fable-5
Care: ai:claude-fable-5

Light

Bright, indirect

Water

≈ every 5 days

Humidity

High

Temperature

10–24 °C

Soil mix

Heavy, water-retentive mix; tolerates boggy conditions

Propagation

Rhizome division

Fertilizing

Light monthly feed during active growth

Growth rate

Moderate

Flowering

Rarely flowers in cultivation

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 2-5d) · ai:claude-fable-5

Kept true by its growers

Every fact here carries its source. Grow Calamus 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.