Ilex latifolia

Ilex latifolia, a holly native to southern China, is best known as a bitter tonic tea often called ku ding cha. The young leaves and mature leaves are prepared as infusions for daily drinking and for perceived clearing heat and supporting digestion in Chinese herbal practice (Chinese Pharmacopoeia Commission, 2015). In the Jiangxi region, rural cooks pour hot water over young shoots for a brisk “leaf tea” that is served with meals and between work shifts (Luo et al., 2012). Across much of southern China and in parts of neighboring Guangxi, tea shops and street stalls serve hot infusions of the fresh or dried leaves as an everyday tonic, often alongside winter melon or lily root blends (Chen, 2013). In some medicinal preparations, a decoction of dried mature leaves is taken with care to moderate strength and duration, a tradition described in national monographs (Zhang and Peng, 2010).

Practical preparation: Everyday tonic tea. Rinse 2–3 g of fresh young leaves briefly under hot water. Bring 200–250 mL of water to a gentle boil, pour over the leaves, and steep 5–8 minutes. Strain and drink warm. A second infusion from the same leaves is often made with fresh hot water for additional cups. Safety note: Contains caffeine; limit to 1–2 cups per day if sensitive to stimulants, and avoid late evening use. Pregnant or nursing people should use caution.

Active constituents: The leaves contain well‑documented xanthine alkaloids, notably caffeine, as well as chlorogenic acid and other phenolic acids that are typical of Ilex species and plausibly underpin the tea’s characteristic bitterness and perceived stimulating properties (Oura et al., 1988).

Modern relevance: Today, standardized ku ding cha leaf tea is widely available in markets across China and online, and pharmacological studies continue to explore the safety and bioactivity of its phenolic and xanthine profile (Zhu et al., 2015).

Common products:
Ilex latifolia is cultivated as an ornamental shrub. Whole plants are sold by nurseries for landscape planting, hedges, privacy screens and topiary. Cut stems bearing glossy evergreen foliage and bright red berries are marketed to florists for seasonal wreaths, garlands and bouquets, especially during winter holiday periods.

Industrial and craft applications:
The heartwood of Ilex latifolia is dense (specific gravity ≈ 0.75 g cm⁻³) and has a fine, interlocked grain with moderate hardness (Janka ≈ 1 100 lb). These properties make the timber suitable for small‑scale carving, turnery, inlay work and hobbyist objects such as tool handles, walking sticks and miniature sculptures. The wood’s low extractives and relatively high lignin content provide natural durability for indoor craft items.

Colorants and tanning:
Leaves contain condensed tannins (≈ 5–7 % of dry weight) and flavonoid pigments; extracts have been studied as natural brown dyes for protein fibres such as wool and silk. Mature fruits are rich in anthocyanins (delphinidin‑3‑glucoside and cyanidin‑3‑glucoside at ≈ 200 mg 100 g⁻¹ fresh weight); these pigments have been evaluated as potential natural red food colourants, showing satisfactory stability under acidic conditions. The leaf tannins also show promise for leather tanning.

Properties relevant to use:
High density and fine grain facilitate precise carving and turning. The anthocyanin concentration yields strong colour intensity suitable for food‑grade natural dyes. Condensed tannin class (proanthocyanidins) provides effective leather‑tanning activity. Moisture‑related shrinkage is low, aiding dimensional stability of small wooden items.

Standards and regulation:
Ornamental plants must meet national plant‑labeling requirements (e.g., USDA‑APHIS plant passport in the United States, EU plant passport). Timber products for craft use should conform to timber‑grading standards such as ISO 13061‑1 (density measurement) and EN 1310 (hardwood classification). Food‑grade colourants derived from Ilex latifolia must comply with additive regulations (U.S. FDA 21 CFR 73.250, EU Regulation 1333/2008).

Sustainability and sourcing:
Commercial supply of Ilex latifolia originates mainly from cultivated stock in nurseries across Japan, South Korea and China; wild harvesting is limited. Sustainable sourcing is supported by certification schemes such as FSC or PEFC when the wood is sold as timber, ensuring that production does not deplete native populations.

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