Many tea enthusiasts may often wonder when purchasing and brewing tea leaves: what are those white or golden hairs attached to the dry tea leaves, and the small fuzz floating on the tea soup? What is the relationship between these hairs and the formation of tea quality?

In fact, these hairs originate from the tender shoots of the tea plant and can also be called tea fuzz. The fuzz on tender shoots is not only a manifestation of tea plant variety characteristics but also plays an important role in the appearance of tea leaves. At the same time, it enhances the quality of the tea soup and increases the economic value of the tea. Buds and leaves with abundant fuzz are a sign of tenderness and high quality; the amount and visibility of fuzz in the finished tea is also one of the important factors in evaluating the quality of tea. Therefore, tea plant fuzz has always received widespread attention from tea producers and consumers.

1. Morphological Characteristics of Tea Fuzz

The fuzz on the back of leaves is a characteristic of the tea plant variety. The length, density, thickness, color, and distribution characteristics of the fuzz on tender shoots vary depending on the variety. The fuzz is mainly located on the lower epidermis of young buds and leaves and contains rich chemical components. The base of the fuzz has glandular cells that secrete aromatic substances, so young buds and leaves with more fuzz often produce teas with a "hairy aroma" (hao xiang).

The fuzz is densest on the bud and falls off naturally as the young leaves mature. For the same variety, the length of fuzz on the back of leaves varies with leaf order. The density of fuzz on different young leaves follows: 1st leaf > 2nd leaf > 3rd leaf, with extremely significant differences.

Tea plant fuzz is distributed not only on the young buds and leaves at the top of new shoots but also commonly on the back of mature leaves, young branches, flower buds, flower buds, and other organs. As the new shoots continue to elongate and the surfaces of various tissues such as young leaves expand, the density of fuzz on the back of young leaves, young stems, flower buds, and other parts gradually becomes sparse.

In spring, as temperatures rise and leaf buds begin to sprout, the fuzz gradually grows. By the time the bud expands, the fuzz has reached a certain length, and the leaves have not yet unfolded, resulting in a high density of fuzz. Therefore, many famous teas are picked mainly as tea buds, one bud with one leaf, or one bud with two leaves. During processing, there is a "ti hao" (raising the fuzz) step to fully utilize the characteristics of the tea fuzz.

2. Tea Fuzz and the Appearance of Dry Tea

Fuzz plays a crucial role in enhancing the appearance of many famous teas. Gongfu black tea, baked green tea, white tea, and many famous teas require visible fuzz. For example, high-grade Keemun and Dianhong are known for their golden fuzz; Huangshan Maofeng, Dongting Biluochun, Xinyang Maojian, etc., are known for their white fuzz; Junshan Yinzhen, Mengding Huangya, Huoshan Huangya, etc., are known for their golden-yellow fuzz; Baihao Yinzhen, White Peony, etc., are famous for their silver fuzz. The famous Taiwanese tea, Dongding Oolong, is also high in fuzz for its premium grades. Fujian Oolong tea generally does not show fuzz, but Oolong tea made from the Maoxie variety also shows fuzz and is of excellent quality.

The color of the dry tea fuzz is closely related to changes in internal compounds during tea processing. In green tea, most of the tea polyphenols are not oxidized. Unoxidized tea polyphenols are colorless, so the fuzz on young buds and leaves is usually white, as seen in famous teas like Biluochun. In contrast, black tea is different; most tea polyphenols have been oxidized into yellowish-red theaflavins and thearubigins. Therefore, black tea made from young buds and leaves has golden-yellow fuzz, such as high-grade Keemun black tea, which is rich in golden fuzz.

3. Tea Fuzz and Tea Flavor Quality

Tea fuzz is rich in quality components such as tea polyphenols, amino acids, caffeine, etc., and has an important impact on the formation of the flavor quality of dry tea. Teachers from Fujian Agriculture and Forestry University once separated the tea body and fuzz of Baihao Yinzhen (Silver Needle) through sieving and measured the biochemical characteristics of the fuzz and the tea body separately.

The contents of tea polyphenols, caffeine, water extract, and other components in tea fuzz were significantly lower than those in the tea body, while the amino acid content was significantly higher than that in the tea body. The fuzz on tea plant tender shoots has the characteristics of high amino acid content and low phenol-to-ammonia ratio, playing an important role in the formation of tea flavor quality.

The density and length of fuzz are positively correlated with the scores of various quality factors of green tea, with the relationship between fuzz and the appearance of green tea being the closest. During green tea processing, after fixing and rolling, some fuzz falls off and adheres to the surface of the tea leaves. When the finished tea is brewed, the tea fuzz dissolves into the tea soup. Because the fuzz contains rich amino acids and other effective components, it enhances the aroma and taste of the tea soup. The tea soup of high-end famous teas (such as Biluochun, Junshan Yinzhen, etc.) has a mellow taste and a clear, high aroma. Besides the tender tea leaves and rich internal components, abundant fuzz is also one of the main factors.

For most tea types, buds and leaves with abundant fuzz represent a high-quality characteristic. Young buds and leaves with more fuzz often produce teas with a hairy aroma, and dry tea with more fuzz tends to have higher freshness. However, the amount of fuzz on tea leaves is not the only criterion for judging the quality of tea. The quality of tea is the result of the combined action of many factors, not just looking at the fuzz or tenderness of the tea leaves. Having a lot of fuzz or visible fuzz is one of the characteristics of certain dry tea products. We can appreciate it, but there is no need to pursue it excessively.