Benifuki

Benifuki is a black-tea cultivar bred at the national tea research station’s Makurazaki branch in Kagoshima, from a cross made in 1965 between Benihomare — Japan’s first nationally registered tea cultivar — and an unnamed Darjeeling-origin accession from the station’s own collection. It took nearly thirty years to reach formal registration, arriving in 1995 as Cha Norin No. 44, by which time the market it was built for had already moved on: sencha from Yabukita and its relatives dominated Japanese tea, and Benifuki was, on paper, one more black tea cultivar among many. What rescued it from obscurity was a discovery that had nothing to do with the purpose it was bred for. Made as unfermented green tea rather than the black or semi-fermented tea its breeders intended, its leaf carries an unusually high concentration of a methylated catechin that ordinary tea barely has at all — and that compound is destroyed by the very fermentation Benifuki was selected to undergo well. Its second career, as a green tea sold against hay fever, is now better known than its first.

Lineage

• Benihomare ♀ (べにほまれ, 茶農林1号) — Japan’s first nationally registered tea cultivar (1953), itself a seedling selected from Assam-type seed brought back from India; contributes its Assam ancestry and its black-tea processing quality.
• Makura-Cd86 ♂ (枕Ｃｄ86) — an accession originating in Darjeeling, India, held in the Makurazaki station’s germplasm collection (“枕” abbreviates Makurazaki). It is a station accession number rather than a cultivar with its own name or independent registration, and its own pedigree is not otherwise documented in the sources consulted.

Benifuki is a controlled cross, not a landrace selection or an open-pollinated seedling — both parents are named. Notably, neither parent is Chinese-type (var. sinensis) Zairai stock of the kind behind Yabukita and most Japanese sencha cultivars; both are Assam- or Darjeeling-type accessions introduced from India, which is a large part of why Benifuki behaves so differently in the cup. The cross itself rests on the breeding record rather than on genetic confirmation: a 2021 DNA study of Japanese tea cultivars using SSR (simple sequence repeat) markers (Kubo, Matsuda, Yanagida, Hotta, Mimura and Kanda, Breeding Science 71(5), 2021) lists Benifuki among the 79 cultivars it examined and carries the Benihomare × Makura-Cd86 pedigree from the literature, but does not mark it as one of the parentages its markers confirmed — and Makura-Cd86, being a station accession rather than a cultivar, is not among the material the study genotyped. No cultivar bred from Benifuki as a parent turned up in the sources consulted for this record.

History

A cultivar from Japan’s first registered black-tea line

In 1875–76 the Meiji government sent Tada Motonobu to China and then India to study black tea production and bring back planting material. He returned with Assam-type (var. assamica) seed, and seedlings grown from it at the Kanaya tea station became known as the “Tada-kei” (Tada-line) black tea cultivars. When Japan’s postwar tea-cultivar registration system named its first batch of cultivars in 1953, one of those Tada-line seedlings — bred at Kanaya under the trial name Kokucha C-8 — was registered as 茶農林1号, Cha Norin No. 1: Benihomare, Japan’s first officially registered tea cultivar of any kind, registered for black tea. (Yabukita, already growing in Shizuoka fields since 1908, followed in the same registration year as Cha Norin No. 6.) Benihomare went on to become a parent of several further black-tea lines, including Benifuji (べにふじ, Cha Norin No. 22, 1960s) and, eventually, Benifuki.

A long gap between the cross and the name

At Makurazaki, breeders crossed Benihomare with Makura-Cd86 — the Darjeeling accession already held in the station’s collection — in 1965, hoping to combine Benihomare’s proven black-tea processing quality with new character from the Darjeeling parent. The resulting seedling was tracked through trials under the name Makurazaki No. 3. It did not reach the market for another twenty-eight to thirty years: MAFF assigned it the national sequence number Cha Norin No. 44 in 1993, and it did not receive formal registration under the Plant Variety Protection Act — registration No. 4591 — until 17 August 1995, named 紅富貴 (Benifuki) for the deep red colour its black and semi-fermented tea liquor produces, paired with a rich, abundant aroma and flavour. Both dates are real, separate events, thirty years removed from the original cross; sources vary on which one they quote as “the” registration year.

A second, unplanned career in green tea

Benifuki’s real fame arrived through a different route. From 2001 to 2006, a national research programme — the tea station together with Kyushu University, Nagoya Women’s University, the University of Shizuoka, Tokyo University of Marine Science and Technology, Asahi Soft Drinks and Morinaga & Co., with NARO researcher Maeda (later Yamamoto) Mari among those credited — investigated a compound found at unusually high levels in Benifuki’s leaf: EGCG3″Me, epigallocatechin-3-O-(3- O-methyl)gallate, a methylated catechin close to negligible in ordinary tea. A patent application followed on 8 August 2003 (特願2003-290789), and NARO announced the results publicly on 9 December 2005. In trials, patients with mild cedar-pollen allergy who drank 2 g of methylated-catechin-rich green tea steeped in 300 ml of hot water twice a day for a month showed significantly less worsening of their symptoms than a control group drinking ordinary tea, with no measurable effect on normal immune function — neutrophil phagocytic activity and NK cell activity were unaffected. The proposed mechanism is that the compound suppresses histamine release from mast cells and reduces the number of high-affinity IgE receptors on their surface; the whole green tea additionally suppresses eosinophil migration and inflammatory cytokine production, suggesting more than one active component is involved. Methylated catechins were also shown to be absorbed into the bloodstream five to six times more efficiently than ordinary tea catechins, and cleared more slowly.

None of this works if the leaf is fermented. NARO’s own handbook states it plainly: methylated catechin content falls when the leaf is made into semi-fermented tea, and is almost entirely absent once it is fully fermented into black tea — the very process Benifuki was bred to be good at. The cultivar that Japan spent thirty years developing as a black tea turned out to matter, commercially and medically, only when processed as the one thing it was never bred to be.

That inversion runs further into cultivation practice. Young shoots carry less methylated catechin than more mature leaf, so growers aiming to preserve the compound are advised against picking overly young buds — the opposite of what fine sencha production usually optimises for. And because Benifuki’s limited cold hardiness had historically confined it to Kyushu, recognition of its functional-food value has been the main force pulling its cultivation into warmer regions across the rest of the country since the 2000s. Benifuki has not abandoned its original purpose in the meantime: it remains a serious black tea in the domestic “wakōcha” (Japanese black tea) revival, winning gold at the 2017 and silver at the 2021 国産紅茶グランプリ (Domestic Black Tea Grand Prix).

Characteristics

Benifuki is a late cultivar. Picking for black tea begins roughly one to two days after Yabukita’s, and picking for green tea begins about a day after Okumidori’s — itself already a late cultivar. Growth habit is spreading (開張型), with stronger vigour than Yabukita, and yield runs 30–50% ahead of it. Cold hardiness is only moderate against ordinary winter leaf scorch, and young trees are particularly prone to split-bark frost injury, so protection is needed while plants are establishing. Disease resistance is strong against anthracnose, ring spot disease and bacterial shoot blight, but weak against tea scale insect and mochi disease, both of which need active control where they occur.

As black or semi-fermented tea — its bred purpose — Benifuki carries high tannin and oxidises well, with a Darjeeling-like aroma and a clear, deep red liquor that has drawn real recognition in Japan’s domestic black tea competitions. As green tea, retailers describe firm astringency settling into a subtle, floral finish, with pan-fired (kamairicha) processing drawing out a fruitier note. But the green-tea market for Benifuki was not built on flavour refinement: it exists because of a specific bioactive compound, and cultivation advice reflects that — the tea is not picked at the tender young stage that most fine sencha prizes, because that is precisely when its signature compound is weakest. Benifuki is, in other words, a rare case of a Japanese tea cultivar whose commercial value runs ahead of, rather than through, its taste.