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Grassleaf Sweet Flag

석창포 (菖蒲) · Acorus gramineus Soland.
Orifice-opening herb Warm (some sources: neutral) Pungent Not specified in the source text
NatureWarm (some sources: neutral)
TastePungent
MeridiansNot specified in the source text
Part usedRhizome
FamilyAcoraceae (formerly Araceae)
CategoryOrifice-opening herb
Find by concern: ForgetfulnessPoor concentrationHearing decline

Overview

Seokchangpo grows on mossy stones beside mountain streams, and the Donguibogam describes how to tell it from its cousins with unusual care: the true leaf has a central ridge like a sword blade, with nine nodes per inch of root (sometimes twelve). Larger-rooted marsh forms, mud calamus and summer calamus look similar and repel fleas and lice, but "cannot be used as medicine," and water calamus has no central ridge at all. The recorded action — "opening the heart’s aperture" — is classically tied to memory, wisdom, and clear hearing.

In the Donguibogam

東醫
寶鑑
性溫一云平, 味辛, 無毒. 主開心孔, 補五藏, 通九竅, 明耳目, 出音聲. 治風濕㿏痺, 殺腹藏蟲, 辟蚤虱, 療多忘, 長智, 止心腹痛.
Source: Donguibogam, Tangaek-pyeon (Herbology volume)
TranslationIts nature is warm (some say neutral), its taste pungent, and it is non-toxic. It mainly opens the heart’s aperture, supplements the five viscera, frees the nine orifices, brightens the ears and eyes, and brings out the voice. It treats wind-damp painful obstruction, kills abdominal parasites, repels fleas and lice, treats forgetfulness, increases wisdom, and stops heart and abdominal pain.

Traditional uses recorded in the Donguibogam

  • Opens the heart’s orifice
  • Clears the senses (ears, eyes, voice)
  • Eases forgetfulness
  • Relieves wind-damp painful obstruction

Traditional applications recorded in the classical text

  • Forgetfulness and poor concentration
  • Dull hearing or hoarse voice
  • Aching, numb joints
  • Heart and abdominal pain (classical use)

Traditional preparation

Root harvested in the 5th or 12th lunar month and shade-dried; harvested fresh it is soft and becomes firm when dried. Good root breaks to a faintly reddish center and is pungent-fragrant when chewed.

This describes traditional preparation recorded in the classics, not a recommendation for use today. DonguiHub does not provide dosage guidance — consult a qualified professional before using any herb.

Cautions

Caution: The Donguibogam records no toxicity, but stresses identification: other calamus-like plants were explicitly judged unfit as medicine. Never harvest wild "calamus" for medicinal use without a firm identification. Consult a professional.
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Frequently asked questions

How do you tell true sweet flag from look-alikes?

By the leaf: the true plant’s leaf has a central ridge like a sword blade, while water calamus has none and a narrower leaf. The Donguibogam also rejects mud and summer calamus as medicine even though they resemble it.

What does "opening the heart’s aperture" mean?

It is a classical term for clearing the mind and senses; in the text it is paired with brightening hearing and sight, bringing out the voice, and treating forgetfulness.

Why was it harvested in specific months?

The text gives the fifth and twelfth lunar months for the root, adding that root harvested exposed on the fifth day of the fifth month "cannot be used."

Sources