How to Brew TCM Herbal Teas: Temperature, Time, and Technique

The difference between a cup of TCM herbal tea that works and one that tastes like hot water often comes down to a single variable: did you use the right method for that herb? A chrysanthemum flower steeped in boiling water for 10 minutes loses its delicate aroma and much of its benefit. An astragalus root steeped for 3 minutes yields almost nothing — its dense, woody constituents require a simmer. This guide covers six categories of herbs, the theory behind each method, and the practical details of temperature, time, and vessel.

For specific herb profiles, see our individual guides: ginger, chrysanthemum, rose, ginseng, goji, and hawthorn.

Infusion vs. Decoction: The Two Fundamental Methods

TCM distinguishes two fundamental preparation methods. An infusion (泡茶 or 泡饮, pao yin) is made by pouring hot water over herbs and letting them steep, covered, for several minutes. It is used for delicate, aromatic, or volatile plant parts — flowers, leaves, and some stems — whose active constituents are easily damaged by prolonged boiling. Chrysanthemum, rose, mint, and green tea are prepared this way.

A decoction (添剂, tang ji) is made by simmering herbs in water for 15–30 minutes. It is used for dense, hard, or woody plant parts — roots, seeds, bark, and some fruits — whose active constituents require sustained heat and time to extract. Astragalus, ginseng, dried jujube, dried longan, cassia seed, and sour date seed are prepared this way.

The reasoning is straightforward: the cell walls of a flower are thin and easily ruptured by hot water, releasing their contents quickly. The cell walls of a root are thick and woody, requiring sustained heat to break down. If you steep a root, you get coloured water with little active content. If you boil a flower, you destroy the very volatile oils you are trying to extract. Matching the method to the herb is the single most important variable in brewing TCM tea.

Six Herb Categories and How to Brew Each

Flowers: Chrysanthemum, Rose, Honeysuckle (Ju Hua / Mei Gui Hua / Jin Yin Hua, 菊花 / 玫瑰花 / 金银花)

Pattern it suits: Patterns requiring gentle heat clearing or qi movement — eye strain, irritability, stress, early sore throat.

Ingredients: 8–12 dried flowers (chrysanthemum), 1–2 teaspoons dried buds (rose), or 1 tablespoon (honeysuckle).

Nature, flavor & meridians (性味归经): Generally cool or warm, sweet to bitter, entering the Liver, Lung, and Heart meridians depending on the flower.

Ascending / descending / floating / sinking (升降浮沉): Ascending and dispersing — volatile oils lift to the head, which is why flower teas are often used for eye, throat, and headache patterns.

Traditional use (功效): Traditionally used to clear heat, move qi, or disperse wind-heat. Flowers are rich in volatile oils that give them their aroma and much of their effect; these oils evaporate quickly at high temperature, which is why brewing technique matters so much for this category.

Brewing method (冲泡方法): Place flowers in a glass or ceramic cup. Pour water at 85–90°C (just off the boil, let it sit for 1 minute after boiling) over them. Cover and steep 5–7 minutes. Re-steep 2–3 times. Do not simmer or use fully boiling water.

Compatibility & contraindications (配伍禁忌): Avoid combining strongly cooling flowers with warming tonics like ginseng, which would create a contradictory formula.

Precautions (注意事项): Cooling flowers (chrysanthemum, honeysuckle) should not be used daily by those with cold digestion. Rose is avoided during pregnancy. Honeysuckle is for short-term use only.

Leaves: Lotus Leaf, Mint, Green Tea (He Ye / Bo He / Lǘ Cha, 荷叶 / 薄荷 / 绿茶)

Pattern it suits: Patterns of heat, dampness, or wind-heat at the exterior — sluggishness, headache, sore throat, foggy head.

Ingredients: 1–2 teaspoons dried, crumbled leaf (lotus leaf); a small handful of fresh or dried mint; 1–2 teaspoons green tea leaves.

Nature, flavor & meridians (性味归经): Generally cool, pungent or bitter, entering the Lung, Liver, and Spleen meridians.

Ascending / descending / floating / sinking (升降浮沉): Ascending and dispersing — leaves vent outward to the body surface, which is the theoretical basis for their use in exterior patterns.

Traditional use (功效): Traditionally used to disperse wind-heat, resolve dampness, or provide gentle alertness. Leaves are less dense than roots but more substantial than flowers; they release their constituents in 3–7 minutes of steeping.

Brewing method (冲泡方法): For dried leaves (lotus leaf): steep in water at 85–90°C for 5–7 minutes. For mint: steep in hot water (just off the boil) for 3–5 minutes; do not simmer, or the volatile oils will be lost. For green tea: steep at 75–80°C for 1–2 minutes; boiling water makes it bitter.

Compatibility & contraindications (配伍禁忌): Mint should not be combined with astringent herbs. Green tea is traditionally not combined with ginseng.

Precautions (注意事项): Mint should be avoided by nursing mothers in large amounts (traditional caution). Green tea contains caffeine; avoid in the evening. Lotus leaf is generally safe but avoid during pregnancy.

Roots: Astragalus, Ginseng, Ginger (Huang Qi / Ren Shen / Sheng Jiang, 黃苒 / 人参 / 生姨)

Pattern it suits: Patterns of qi deficiency, cold, or exterior wind-cold — fatigue, loose stools, cold limbs, morning nausea.

Ingredients: 10–15 g astragalus slices; 3–6 g ginseng slices; 3–4 slices fresh ginger.

Nature, flavor & meridians (性味归经): Warm (ginger, Asian ginseng) to neutral (astragalus), sweet or pungent, entering the Spleen, Lung, and Stomach meridians.

Ascending / descending / floating / sinking (升降浮沉): Ascending (astragalus, ginseng) or dispersing (ginger) — roots tonify and lift, or warm and release.

Traditional use (功效): Traditionally used to tonify qi, warm the middle, or release the exterior. Roots are the densest herb category; their active constituents are locked in woody fibres that require sustained heat to extract. A quick steep yields almost nothing.

Brewing method (冲泡方法): Place root slices in a small pot with 3 cups of water. Bring to a gentle boil, then reduce heat and simmer 15–20 minutes (20–30 minutes for astragalus). Strain and drink. For ginseng, use a lower heat and a longer simmer; the slices can be re-simmered 2–3 times and eaten at the end.

Compatibility & contraindications (配伍禁忌): Ginseng is traditionally incompatible with Veratrum nigrum and should not be combined with green tea or turnip. Astragalus should not be combined with sweat-inducing formulas during active illness.

Precautions (注意事项): Astragalus and ginseng should be avoided during active colds and flu. Ginger is warming; avoid during fever or yellow-phlegm conditions. Ginseng may interact with anticoagulant and blood-sugar medication.

Seeds: Cassia Seed, Sour Date Seed (Jue Ming Zi / Suan Zao Ren, 决明子 / 酸枣仁)

Pattern it suits: Patterns of Liver heat with constipation, or Heart and Liver yin deficiency with insomnia — dry eyes, constipation, restless sleep.

Ingredients: 1–2 tablespoons cassia seeds; 10–15 g sour date seeds.

Nature, flavor & meridians (性味归经): Cool (cassia) to neutral (sour date seed), sweet to sour, entering the Liver, Heart, and Large Intestine meridians.

Ascending / descending / floating / sinking (升降浮沉): Descending (cassia drains heat downward) or gathering (sour date seed astringes scattered qi inward).

Traditional use (功效): Traditionally used to clear Liver heat, moisten the intestines (cassia), or nourish Heart and Liver yin and calm the spirit (sour date seed). Seeds have hard outer coats that must be cracked or simmered to release their constituents. See our sour date seed tea guide.

Brewing method (冲泡方法): For cassia seeds: lightly toast in a dry pan for 2–3 minutes, then simmer 1–2 tablespoons in 2 cups of water for 10 minutes. For sour date seeds: lightly crush 10–15 g and simmer in 2 cups of water for 20 minutes. Strain and drink.

Compatibility & contraindications (配伍禁忌): Cassia seed should not be combined with astringent herbs. Sour date seed is often combined with lily bulb or jujube in classical sleep formulas.

Precautions (注意事项): Cassia seed can cause loose stools; start with a small amount. Sour date seed may enhance the effect of sedatives; consult your provider if taking sleep medication. Avoid both during pregnancy without professional guidance.

Fruits and Berries: Jujube, Longan, Goji, Hawthorn (Da Zao / Gui Yuan / Gou Qi Zi / Shan Zha, 大枣 / 桂圓 / 构杉子 / 山楖)

Pattern it suits: Patterns of blood deficiency, yin deficiency, or food stagnation — pallor, dry skin, poor sleep, post-meal bloating.

Ingredients: 6–8 jujube dates; 10–15 longans; 1 tablespoon goji; 1–2 tablespoons hawthorn.

Nature, flavor & meridians (性味归经): Warm (jujube, longan) to neutral (goji) to warm (hawthorn), sweet or sour, entering the Spleen, Heart, Liver, and Kidney meridians.

Ascending / descending / floating / sinking (升降浮沉): Slightly ascending and nourishing (jujube, longan) or descending (hawthorn). Goji is nourishing and slightly descending.

Traditional use (功效): Traditionally used to nourish blood, calm the spirit, nourish yin, or aid digestion. Dried fruits need time to rehydrate and release their constituents; a simmer is more effective than a quick steep, though goji can be simply steeped.

Brewing method (冲泡方法): For jujube and longan: pit the fruits, simmer in 3 cups of water for 15–20 minutes. The softened fruit can be eaten. For goji: steep in hot water for 7–10 minutes; the berries plump and can be eaten. For hawthorn: simmer 1–2 tablespoons in 2 cups of water for 10–15 minutes; add rock sugar to taste.

Compatibility & contraindications (配伍禁忌): Hawthorn is traditionally incompatible with ginseng. Jujube moderates and harmonises other herbs but should not be combined with strong purgatives.

Precautions (注意事项): Jujube and longan are warming and sweet; avoid during active colds, flu, or heat patterns. Hawthorn is sour; do not drink on an empty stomach. Goji should be used cautiously with anticoagulant medication.

Blends: Layering Herbs by Density (Fu Fang, 复方)

Pattern it suits: When multiple herbs are combined to address a complex pattern — e.g., qi deficiency with dampness, or yin deficiency with heat.

Ingredients: Example blend: 10 g astragalus + 6 jujube dates + 3 slices ginger + 1 teaspoon goji.

Nature, flavor & meridians (性味归经): Depends on the herbs chosen; the key principle is that tonifying and nourishing herbs form the base, while moving or clearing herbs are added in smaller amounts.

Ascending / descending / floating / sinking (升降浮沉): Mixed — the blend's overall direction depends on the chief herb.

Traditional use (功效): TCM formulas traditionally combine 3–5 herbs in a hierarchy: a chief (君), a deputy (臣), an assistant (使), and an envoy (使者). For home tea blends, the simplest version is to combine one tonifying base herb with one harmonising fruit and one moving or clearing herb.

Brewing method (冲泡方法): Simmer the densest herbs (roots, seeds) first for 10–15 minutes. Add fruits and berries and simmer another 5–10 minutes. Remove from heat, add flowers or leaves, cover, and steep 5 minutes. This layering ensures each herb releases its constituents at the right temperature without being destroyed.

Compatibility & contraindications (配伍禁忌): Check the compatibility notes for each individual herb. Classical incompatibilities (e.g., ginseng + hawthorn) apply even within a blend.

Precautions (注意事项): Check contraindications for every herb in the blend. Avoid mixing strongly warming and strongly cooling herbs unless you understand the pattern you are addressing. When in doubt, brew herbs separately and drink them at different times of day.

Practical Details: Water, Vessel, and Storage

• Water: Filtered or spring water produces a cleaner-tasting tea than hard tap water. The mineral content of the water affects extraction.
• Vessel: Glass is ideal for flowers (you can see the colour) and does not retain flavours. Ceramic or unglazed clay is ideal for roots and roasted herbs. Avoid iron and aluminium, which can react with tannins and other constituents. A small clay teapot dedicated to one type of tea will season over time.
• Covering: Always cover the cup or pot while steeping. Many herbs' active constituents are in volatile oils that evaporate with steam if left uncovered.
• Re-steeping: Most herbs can be re-steeped 2–3 times. The first steep is usually the most aromatic; the second is often the most balanced. Roots can be re-simmered with fresh water.
• Storage: Keep dried herbs in airtight containers away from light and moisture. Aged herbs like tangerine peel (chen pi) actually improve with time; most others are best used within 1–2 years.
• Timing: Tonifying teas (ginseng, astragalus) in the morning. Calming and nourishing teas (jujube, longan, sour date seed) in the afternoon or evening. Digestive teas (hawthorn, tangerine peel) after meals.

The Bottom Line

Brewing TCM herbal tea is not difficult, but it is specific. Match the method to the herb: steep flowers, simmer roots, and layer blends by density. Use the right temperature — boiling for roots, just off the boil for most herbs, and 75–80°C for green tea. Cover the vessel, use good water, and re-steep to get the full value from each herb. The difference between a forgettable cup and an effective one is usually a few minutes of simmering and 10 degrees of temperature. For the full safety context, see our herbal tea safety guide.