Uji-Hikari

Uji-hikari is a mid-season Kyoto cultivar selected in 1954 by the Kyoto Prefectural Tea Research Institute from Uji zairai stock, and grown almost exclusively for tencha and gyokuro. It is one of three cultivars — with Asahi and Samidori — that Kyoto Prefecture names as its principal hand-picked tencha cultivars, and the one of the three actually bred in-house at the institute rather than found in a grower’s own field. Its thin, soft, pale leaf is exactly what shaded processing wants: it dries flat and even, takes on a bright, clear colour, and absorbs the covering colour of shade cultivation unusually well.

Lineage

• Uji zairai (landrace) seedling population — the seed-grown local stock the institute drew its numbered selections from. As with any landrace selection, no individual pollen parent is recorded or recoverable.

Uji-hikari is not a controlled cross but a single-plant selection out of Uji’s seed-grown zairai fields, formalised under the institute’s own in-house strain number rather than a grower’s personal one. It shares its 1954 selection year with Gokou (Kyoken No. 166), which the institute bred the same way, and with Ujimidori (Kyoken No. 307), added to the same numbered series in 1983 for gyokuro. The Kyoto Prefectural Tea Research Institute’s own page labels Asahi, Samidori, Gokou and Ujimidori explicitly as “(宇治在来種選抜)” — Uji zairai selections — in their history sections, but the parenthetical is absent from Uji-hikari’s entry alone even though Gokou’s year and breeder are identical; no source suggests a different origin, so this is treated as an inconsistency in the source rather than a real distinction (see conflicts).

History

The 京研 series

Kyoto’s showcase Uji tencha cultivars were formalised in a single push in 1954, but from two different directions. Asahi and Samidori began as individual growers’ own selections — Asahi was picked out by Hirano Jinnojō and carried his field number, Hirano No. 11 (平野11号); Samidori was picked out by Koyama Masajirō as Koyama No. 69 (小山69号) — before the Kyoto Prefectural Tea Research Institute trialled and promoted them. Uji-hikari and Gokou, by contrast, were selected and numbered by the institute itself, under its own strain-numbering series: 京研 (Kyōken), read as an abbreviation of the institute’s name, 京都府茶業研究所. Uji-hikari is Kyoken No. 170; Gokou is Kyoken No. 166. The institute later extended the same series to Ujimidori, Kyoken No. 307, selected in 1983 (Showa 58). The number identifies an internal breeding-line record rather than a public registration — it is a lab accession number, not a trademark or a legal designation.

Registration status

None of the four 1954 selections — Asahi, Samidori, Uji-hikari, Gokou — was ever put through formal variety registration (品種登録). The institute’s own page records only a 育成年 (development year) of 1954 for each of them, and no 茶農林 (Cha Norin) number or Plant Variety Protection Act filing for any of the four turns up in the MAFF registration record, the NARO cultivar handbook, or any Japanese-language source checked. That stands in contrast to the institute’s later work: when it bred Tenmyo and Housyun from open-pollinated Samidori seedlings (selection begun in 1977), both were carried through a formal 品種登録 and registered in February 2006 — and the institute’s page marks that with an explicit 登録年 field that Uji-hikari’s entry does not have. Uji-hikari’s status is best described as a Kyoto Prefecture recommended cultivar (茶奨励品種): it appears on the prefecture’s own cultivation-characteristics table for tea it recommends growers plant, but it has no MAFF or Plant Variety Protection Act registration of its own.

In practice and in the record

Kyoto Prefecture’s own summary of the group states that Asahi, Samidori and Uji-hikari are cultivated as its principal tencha cultivars, all under intensive, hand-picked management, and that together they constitute the premium tencha that represents the Uji-cha brand; separately, alongside Gokou and Ujimidori, Uji-hikari is named as one of Kyoto’s main gyokuro cultivars too. Outside Kyoto, Uji-hikari surfaces in the national tea-research literature: a 1990 study in Chagyo Kenkyu Hokoku (Tea Research Journal) on the characteristics of major green-tea cultivars found that the cross-sectional diameter of pruned branches was small for Uji-hikari, as it was for Gokou, relative to other cultivars tested. A follow-up 1991 study, run in a regional adaptation trial at Mizobe, Kagoshima, recorded Uji-hikari among the early-budding cultivars — alongside Asahi, Yutakamidori, Asatsuyu and Yamakai — that suffered severe damage in a late frost, and among the lowest-yielding cultivars in a seedling-transplant comparison there. That reading sits awkwardly against Kyoto’s own “medium, level with or slightly behind Yabukita” classification; the discrepancy is recorded rather than resolved (see conflicts).

Characteristics

Budding is medium (中生) by Kyoto Prefecture’s own classification — level with Yabukita or up to two days later — though the tree grows only slightly upright, with medium vigour and a canopy spread that runs slightly larger than Yabukita’s. Cutting-rooting ability and early growth are both rated medium. New shoots are slightly small, thin and a somewhat pale green, with a delicate form and less luster than either Asahi or Samidori show at the same stage; the mature leaf is long-oval and notably soft. Branch diameter after pruning is small, a trait it shares with Gokou. Yield is medium and sits below Yabukita’s, and the picking period is short — the same combination of traits that limits Asahi’s output.

Cold tolerance is the clearest weakness: Kyoto Prefecture’s own table advises against planting Uji-hikari in the prefecture’s colder districts, a caution it does not extend to Samidori, which it rates as suitable for cold ground, and a different kind of caution than the one it gives Asahi, whose buds are simply sensitive to late frost. Anthracnose resistance is medium, in line with Asahi and Samidori. Against ring spot disease, though, Uji-hikari does better than either of the other two — its resistance is rated medium, while Asahi’s and Samidori’s are both rated slightly weak.

In the cup, this is a shade-tea specialist through and through: Kyoto’s own table marks it strong for gyokuro and only secondary for tencha, and does not recommend it for sencha at all. As tencha, the institute’s own description is that its shape comes out well-matched and soft, its colour bright and clear, and that it takes on shading colour particularly well. As gyokuro, the leaf twists fine and rolls tight, with real clarity in the finished tea. A retailer’s tasting notes on a graded lot describe a young fragrance over a soft, matured body, with a pale yellow-green liquor and a moist, rounded texture — consistent with a thin, soft leaf that has spent real time under shade. Set beside Asahi and Samidori, Uji-hikari is the thinnest and palest-leaved of Kyoto’s three flagship tencha cultivars, which is precisely why processors like it for tencha, but the same thinness comes with the lowest vigour and the weakest cold tolerance of the three.