Bamboo Leaves竹叶

Classification and Origin

Category: herbal infusions and dried flowers (代用茶, dàiyòng chá) — outside the botanical category of tea from Camellia sinensis

grasses (Poaceae / Gramineae), subfamily bamboos (Bambusoideae).

leaves of bamboos of the genus Phyllostachys — primarily 淡竹 (dànzhú) and 毛竹 (máozhú, Phyllostachys edulis).

Origin: subtropical belt of China — Zhejiang, Fujian, Jiangxi, Hunan, Anhui, Sichuan.

Type: herbal infusion, tea substitute (代用茶, dàiyòng chá); botanically not tea.

Facts

the same character 青 in the name 竹叶青 from Mount Emei refers to a green tea from camellia — a classic source of confusion.

wide leaves of related bamboos are used for wrapping zongzi and other rice dishes, imparting a vegetal aroma to them.

bamboo leaf flavonoid extract has entered Chinese food practice as a permitted antioxidant, which is atypical for "tea" herbs.

the high accumulation of silica in bamboo tissues is one of the reasons for its strength and for the special "green" minerality of the raw material.

History and Culture

a seasonal "cooling" beverage for the hot months, cheap and ubiquitous.

wide leaves of bamboos (for example, 箬叶, ruòyè, leaves of Indocalamus) are traditionally used to wrap zongzi (粽子) — rice pyramids; this is a separate culinary line, unrelated to steeping.

Botany and Raw Material

a perennial woody grass with a hollow jointed culm-stalk.

lanceolate, with a pointed apex, parallel venation, and a characteristic fine transverse "network" between the veins.

young tender leaves (嫩叶, nènyè), gathered from branches.

淡竹叶 leaves are thinner and softer, the plant is low, herbaceous, with thickened rootlets, whereas true bamboo is tree-like.

Terroir

Climate: humid subtropical, with warm summers and abundant precipitation.

Soil: acidic, loose, well-drained mountain soils.

vast tracts of moso bamboo (毛竹) in Zhejiang (including Anji County, 安吉), Fujian, Jiangxi, Hunan, Anhui.

predominantly spring to summer, when the leaf is young; raw material may be either wild or from plantation bamboo groves.

Production

selection of young leaves, removal of coarse petioles and debris.

by hot air or in the sun to a stable moisture content.

Organoleptic Profile

from green to yellowish-green, lanceolate, with a noticeable vein; aroma of dry grass and fresh hay.

from light yellow-green to pale golden, transparent.

fresh herbaceous-grassy, with a light note of bamboo greenery and a hint of hay.

light, soft, slightly sweetish, with a sensation of coolness and weak astringency; the body of the infusion is thin.

short, with a hint of returning sweetness (回甘, huígān).

Chemical Composition

chlorogenic, p-coumaric, ferulic, and others.

bamboo actively accumulates silica (silicon dioxide) in its tissues.

potassium, manganese, and others in trace amounts.

contribute to the aroma.

absent, unlike true tea, which is important for those who avoid caffeine.

Health Notes

bamboo leaf is classified as a "cooling" product; it is credited with the ability to "clear heat and relieve restlessness" (清热除烦, qīngrè chúfán), and to "generate fluids and promote urination" (生津利尿, shēngjīn lìniào). These are categories of folk and traditional medicine, not proven clinical effects.

bamboo leaf flavonoids are investigated as antioxidants in vitro and in model systems; bamboo leaf extract is used in China as a permitted food antioxidant. This pertains to food chemistry, not to treatment.

the absence of caffeine makes the beverage suitable for evening consumption.

Brewing

approximately 3–5 g of leaf per 300–400 ml of water.

90–100 °C; the leaf withstands boiling water; for a soft infusion, 90–95 °C is sufficient.

first infusion 3–5 minutes for simple steeping; in gongfu style — shorter, sustains 2–3 infusions, after which the flavour quickly fades.

in summer, a cold infusion is appropriate — pour cool water over the leaf and steep for several hours in the refrigerator, or brew hot and cool with ice.

pairs neutrally with rock sugar (冰糖, bīngtáng) or chrysanthemum flowers (菊花, júhuā) — this is a matter of taste, not a mandatory recipe.

Teaware: glass or porcelain teapot, gaiwan, or simply a cup — the leaf is unpretentious.

Storage

Container: a tightly closed vessel or moisture-proof bag.

Shelf Life: the aroma is most pronounced in the first year to year and a half, thereafter gradually fades.

a dry, cool, dark place, free from extraneous odours.

elevated humidity leads to caking and mould; the leaf readily absorbs odours.

Price and Authenticity

around 70 ¥/kg for ordinary dried bamboo leaf; this is an order-of-magnitude guide, not a retail price, which depends on grade, processing, and packaging.

whole or cut lanceolate leaves from green to yellowish-green in colour, with a pointed apex, parallel venation, and a fine transverse network; fresh herbaceous smell.