Natural Herb Library

Rhizome of Grassleaf Sweetflag

Chinese
菖蒲
Pinyin
Chang Pu
Latin
Rhizoma Acori Graminei
Botanical illustration of Rhizome of Grassleaf Sweetflag, Acorus gramineus, showing aromatic sweetflag rhizome, cut surfaces, and diagnostic source details.
Botanical plate by Kodi .

Known in TCM as Chang Pu (菖蒲), this acrid and bitter, warm herb enters the Heart and Stomach. Traditionally, it opens the orifices and transforms turbidity ... Chang Pu is used when clouded thinking, phlegm obstruction, dizziness, or confusion suggest that clear yang is not reaching the head well, most often applied for cognitive decline, insomnia, and epilepsy. Modern research has identified Alpha-asarone among its active constituents.

Part used: Rhizome

Also Known As

Acorus gramineus Rhizome Chang Pu Grassleaf Sweetflag Rhizome

Latin: Rhizoma Acori Graminei | Pinyin: Chang Pu | Chinese: 菖蒲

TCM Properties

Taste
acrid, bitter
Temperature
warm
Channels
Heart, Stomach

Traditional Use

Primary Actions

  • Opens the orifices and transforms turbidity ... Chang Pu is used when clouded thinking, phlegm obstruction, dizziness, or confusion suggest that clear yang is not reaching the head well.
  • Calms the spirit and benefits cognition ... traditional use includes forgetfulness, poor concentration, fright, and restlessness when turbidity and dampness burden the Heart-mind.
  • Transforms dampness and harmonizes the middle ... it also helps nausea, poor appetite, abdominal fullness, and foul turbidity affecting digestion.

Secondary Actions

  • This page follows the imported Acorus gramineus or generic `Chang Pu` lane and should stay distinct from the already-live `grassleaf-sweetflag-rhizome` page, which the library anchors to the `Shi Chang Pu` or Acorus tatarinowii tradition.
  • The overlap is real, but the species and naming lane matter enough that the distinction should be stated rather than hidden.

Classic Formulas

  • Ding Zhi Wan-style pairings ... Chang Pu is used when phlegm-turbidity, fright, and forgetfulness combine.
  • Orifice-opening combinations with Yu Jin or Zhu Ru ... classical logic when phlegm-heat and clouded consciousness travel together.
  • Middle-burner aromatic formulas ... used when nausea and damp-turbidity accompany mental fog.

Classical References

  • Traditional references describe Chang Pu as an aromatic warm rhizome that opens the orifices, transforms dampness, and benefits the spirit.
  • In this library, the specific distinction from Shi Chang Pu is part of the record's value because source confusion is common.

Modern Research

Active Compounds

  • Alpha-asarone and beta-asarone ... key aromatic phenylpropanoids associated with Acorus gramineus research
  • Essential-oil fractions ... central to neuroprotective and cognition-oriented investigation
  • Other volatile and phenolic constituents ... supportive bioactive compounds in anti-inflammatory and neurologic models

Studied Effects

  • A 2022 review summarized the therapeutic potential of active components from Acorus gramineus and Acorus tatarinowii in neurological disorders, providing a modern bridge between classical cognition use and contemporary preclinical research (PMID 36628348).
  • A 2020 review focused specifically on Acorus gramineus preclinical evidence for cognitive-function impairment and described multiple possible neuroprotective mechanisms (PMID 32908635).
  • Modern interest in essential oils from aromatic medicinal plants also supports broader neuroprotective and anti-aging interest in Acorus-type aromatic rhizomes, though concentrated products are not equivalent to ordinary crude-herb use (PMID 28611658).

PubMed References

Safety & Interactions

Contraindications

  • Yin deficiency with heat or dryness without damp-turbidity
  • Use of concentrated volatile-oil products in place of standard crude-herb dosing

Cautions

  • Acorus products rich in asarones deserve more caution than ordinary crude-herb slices or light decoction use.
  • Because source confusion among Chang Pu materials is common, authenticated material matters.

Conditions

Frequently Asked Questions

What is Rhizome of Grassleaf Sweetflag used for?

Rhizome of Grassleaf Sweetflag is traditionally used to Opens the orifices and transforms turbidity ... Chang Pu is used when clouded thinking, phlegm obstruction, dizziness, or confusion suggest that clear yang is not reaching the head well., Calms the spirit and benefits cognition ... traditional use includes forgetfulness, poor concentration, fright, and restlessness when turbidity and dampness burden the Heart-mind., Transforms dampness and harmonizes the middle ... it also helps nausea, poor appetite, abdominal fullness, and foul turbidity affecting digestion.. Research has investigated its effects on: A 2022 review summarized the therapeutic potential of active components from Acorus gramineus and Acorus tatarinowii in neurological disorders, providing a modern bridge between classical cognition use and contemporary preclinical research (PMID 36628348).; A 2020 review focused specifically on Acorus gramineus preclinical evidence for cognitive-function impairment and described multiple possible neuroprotective mechanisms (PMID 32908635)..

What are other names for Rhizome of Grassleaf Sweetflag?

Rhizome of Grassleaf Sweetflag is also known as Acorus gramineus Rhizome, Chang Pu, Grassleaf Sweetflag Rhizome. In TCM: 菖蒲 (Chang Pu); Rhizoma Acori Graminei.

Is Rhizome of Grassleaf Sweetflag safe during pregnancy?

The safety of Rhizome of Grassleaf Sweetflag during pregnancy has not been established. Consult a qualified healthcare provider before use.

What are the contraindications for Rhizome of Grassleaf Sweetflag?

Rhizome of Grassleaf Sweetflag should not be used in: Yin deficiency with heat or dryness without damp-turbidity; Use of concentrated volatile-oil products in place of standard crude-herb dosing. Consult a qualified practitioner before use.