The roots (Gēn)
Roots (gēn) are among the most frequently used plant parts due to their high concentration of active ingredients, associated with the Earth element, a symbol of stability and nourishment.
They are harvested in autumn or winter, when the plant’s energy is concentrated underground. For example, Dǎng Shēn (Codonopsis pilosula) tonifies the Spleen and Stomach Qi. It is used in cases of chronic fatigue or digestive disorders.
Huáng Qí (Astragalus membranaceus), another tonifying root, strengthens defensive Qi (wèi qì) to support immunity and prevent infections. Roots like Shēng Dì Huáng (Rehmannia glutinosa) nourish Yin and are prescribed for Yin deficiency syndromes, such as thirst or hot flashes.
The Leaves (Yè)
The leaves (yè), associated with the Wood element, capture the energy of wind and movement. They are harvested in spring or summer, when their vitality is at its peak.
Sāng Yè (Morus alba) disperses wind-heat in lung ailments, such as dry coughs or mild fevers.
Bò He (Mentha haplocalyx), with its aromatic leaves, clears the surface (biǎo) by promoting sweating in cases of external attack syndromes. Their action is often ascending and dispersing, targeting the superficial layers of the body.
The Stems (Jīng)
The stems (jīng) regulate the movement of qi, whether ascending (shēng) or descending (jiàng). Harvested in spring, they embody the vigor of the sap.
Pú Gōng Yīng (Taraxacum mongolicum) drains damp-heat and is used for urinary tract infections and abscesses.
Húo Má Rén (Cannabis sativa, stem) acts on the intestines to lubricate and facilitate defecation in cases of constipation.
Flowers (Huā)
Flowers (huā), associated with the Fire element, are harvested at their peak bloom to capture their yang energy. They often influence emotional state and Liver function.
Jú Huā (Chrysanthemum morifolium) soothes the Liver, clarifies vision, and disperses wind-heat, and is indicated for headaches and eye irritations.
Jīn Yín Huā (Lonicera japonica) eliminates toxic heat in infections such as tonsillitis.
Bark (Pí)
Bark (pí), associated with the Metal element, is harvested in autumn or spring when the sap is abundant. It has protective and astringent properties.
Dù Zhòng (Eucommia ulmoides) strengthens the Kidneys and bones; it is used for lower back pain. Huáng Bǎi (Phellodendron amurense) drains damp-heat, particularly in genitourinary infections.
Seeds (Zǐ)
Seeds (zǐ), associated with the Water element, are harvested when ripe for their ability to store vital energy (jīng). Gǒu Qǐ Zǐ (Lycium barbarum) nourishes the yin of the Liver and Kidneys, improving vision and vitality. Sū Zǐ (Perilla frutescens) lowers pulmonary qi, relieving asthma or cough.