What are Oita’s heirloom vegetables? Features, season, and ways to eat the 16 items organized by the association (Sorin kabocha, Kuju takana, Yaso seri) explained

Oita Prefecture's heirloom vegetables are a group of cultivars grown across diverse regions—the Setouchi coast of the Kunisaki Peninsula and Usa, the Aso-Kuju foothills of Yufu and Kuju, the Bungo Channel coast of Usuki and Saiki, and the Hita Basin.The Japan Traditional Vegetable Promotion Associationorganizes a total of 16 items from Oita Prefecture: 13 heirloom vegetables and 3 heirloom fruit trees (as of this writing).

We introduce items handed down in Bungo, including the revived cultivar linked to Otomo Sorin, "Sorin pumpkin" (Bungo pumpkin = a kikuza kabocha lineage), Kuju takana of the Kuju highlands, Beppu's aonaga jibai cucumber, Usuki's large ginger, Taketa's chorogi, and yasozeri (Oita's name for watercress) of Yufuin and Kuju.

The definition of "heirloom vegetable" and the scope of this article

Certifying body	Main criteria
Kyoto Prefecture "Kyoto Heirloom Vegetables"	Cultivation history predating the Meiji era, covering the entire prefecture
Osaka Prefecture "Naniwa Heirloom Vegetables"	Grown within Osaka Prefecture from roughly 100 or more years ago, with clear provenance, Osaka-specific or regional character, and produced within the prefecture
Nagano Prefecture "Shinshu Heirloom Vegetable Certification System"	Cultivation, food culture, and varietal traits from before the 1955–1964 period
Oita Prefecture	A prefecture-specific "heirloom vegetable" definition has not been confirmed as of this writing. The Japan Heirloom Vegetable Promotion Association organizes 13 heirloom vegetables and 3 heirloom fruit trees

In this article, of the 16 Oita items organized by the Japan Heirloom Vegetable Promotion Association, we cover 13 vegetables in the main text, and introduce the 3 heirloom fruit trees in the "Other local specialty cultivars" section at the end. Shiitake (Kunisaki Peninsula / Usa area) is categorized in MAFF statistics as a "special forest product," separate from vegetables (agricultural products), but because it is included in the Association's organization, we list it in this article's table and treat it, like the Association, as one of the 13 items.

Main items of Oita's heirloom vegetables

Item	Features	Growing region	Season
Aotade	A knotweed of the Polygonaceae family. Compared with common red tade, its leaves are green and its pungency is said to be milder	Taketa City, Kokonoe Town	Around June
Aonaga jibai cucumber	About 1kg; contrast of green and white	Beppu City	June to October
Usuki's large ginger	Large rhizome; easy to cook	Usuki City	Late November
Kuju takana	Highland-grown; overwinters; strong pungency	Kuju, Taketa City	Late March
Sudo cucumber	Superb flesh; standout aroma	Mainly home gardens	Around July
Sorin pumpkin	A cultivar revived by Usuki City from Bungo pumpkin (kikuza kabocha); sticky, low sweetness	Usuki City	June–September
Yurihonjo City, Nikaho City	Whorl-shaped rhizome; crisp	Taketa City	Late November to December
Mataguro	Taro; cold-hardy	Iida, Kokonoe Town, Kusu District	October (before frost)
Mitori bean	Cowpea; skin resists splitting	Nagasu, Usa City and other areas of the prefecture (for home use / sekihan)	Late July–early August
Muta tokibi	A chewy, springy native corn. Mainly self-saved seed, so supply is limited	Kokonoe Town, Kusu District	Summer–autumn (mainly self-saved seed, so timing varies by year)
Yakatajima imo	Red-and-white sweet potato; rare variety	Yakatajima, Kamae, Saiki City	Autumn
Yasozeri	Oita's name for watercress; refreshing aroma	Yufuin, Yufu City / Kuju, Taketa City	March–June
shiitake	Thick-fleshed; rich aroma	Kunisaki Peninsula / Usa area	Mid-October–April

Characteristics and how to eat 7 representative Oita heirloom vegetables

Sorin pumpkin — a native variety linked to pumpkin's arrival, revived in Usuki

Season	June–September
Growing region	Usuki City
Well-suited dishes	Simmered dishes, tempura, potage, dengaku

Sorin pumpkin is a Japanese pumpkin grown in Usuki City, a cultivar that Usuki City revived and branded from the once-grown "Bungo pumpkin (kikuza kabocha)" (Usuki City official). It is tied to the legend of pumpkin's arrival in Japan—a Portuguese ship drifting ashore in Bungo in 1541 (Tenbun 10) brought pumpkin, and it was presented to Otomo Sorin at the start of trade in 1548 (Tenbun 17) (per Oita Prefectural Library reference and others)—and was named "Sorin pumpkin" after the Christian daimyo Otomo Sorin. The flesh is sticky with restrained sweetness, pairs well with soy sauce and dashi, and shows its qualities in simmered dishes, tempura, and potage.

In its June–September season it is sometimes shipped to farm stands within Usuki City.

Kuju takana — a strongly pungent takana of the Kuju highlands

Season	Late March
Growing region	Kuju, Taketa City
Well-suited dishes	Takana pickles, stir-fries, rice balls, fried rice

Kuju takana is a native takana grown in Kuju, Taketa City (the Aso-Kuju highlands), characterized by strong pungency. Its harvest is in late March, and after processing it circulates year-round as takana pickles or onigiri filling.

Distribution is mainly as pickles; it can be found at pickle makers and JA farm stands within Taketa City.

Aonaga jibai cucumber — Beppu's 1kg-class large cucumber

Season	June to October
Growing region	Beppu City
Well-suited dishes	Sashimi garnish, salad, quick pickles, vinegared dishes

The aonaga jibai cucumber is a large cucumber grown in Beppu City, characterized by a weight of around 1kg and a contrast of green and white. Grown by ground-trailing cultivation, it is used for sashimi garnish, salad, and quick pickles.

In its June–October season it is shipped to farm stands within Beppu City (distribution is limited).

Usuki's large ginger — a large ginger that's easy to cook

Season	Late November
Growing region	Usuki City
Well-suited dishes	Sweet-vinegar pickles, tsukudani, ginger-fried dishes, condiment

Usuki's large ginger is a native large ginger grown in Usuki City, characterized by a large rhizome that's easy to cook. It's used as an ingredient for sweet-vinegar pickles, tsukudani, and ginger-fried dishes.

In its late-November season it is sometimes shipped to farm stands within Usuki City.

Yasozeri — the watercress of Yufuin and Kuju

Season	March–June
Growing region	Yufuin, Yufu City / Kuju, Taketa City
Well-suited dishes	Salad, garnish for meat dishes, tempura, sauce

Yasozeri is Oita's name for watercress (the Brassicaceae plant Nasturtium officinale), grown in the clear-stream areas of Yufuin (Yufu City) and Kuju (Taketa City). European watercress naturalized across Japan from the Meiji era onward, and in Yufuin and Kuju it took hold along the clear streams and came to be used as a local ingredient, which is why it is included in the Japan Heirloom Vegetable Promotion Association's organization. Its refreshing aroma and slightly bitter pungency are its hallmarks.

Used in salads, as a garnish for meat dishes, in tempura and sauces, it can be found at farm stands in Yufuin and Kuju from spring into early summer.

Mitori bean — Usa Nagasu's split-resistant cowpea

Season	Late July–early August
Growing region	Centered on the Nagasu area of Usa City, and across the prefecture (widely grown for home use / sekihan in the Kunisaki Peninsula, Oita City, Usuki City, and elsewhere)
Well-suited dishes	Simmered beans, sekihan, bean rice, amanatto

The mitori bean is a native cowpea handed down mainly in the Nagasu area of Usa City and across Oita Prefecture (Kunisaki Peninsula, Oita City, Usuki City, and elsewhere) for home use and sekihan; because its skin resists splitting, it suits sekihan (Oita Prefecture official). It is also used for simmered beans, bean rice, and amanatto.

In its late-July–early-August season it is shipped to farm stands within Usa City (supply is limited).

Chorogi — Taketa's whorl-shaped rhizome

Season	Late November to December
Growing region	Taketa City
Well-suited dishes	Plum-vinegar pickles, osechi, tempura, dressed dishes

Chorogi is a Lamiaceae rhizome grown in Taketa City, characterized by a distinctive whorl shape and a crisp bite. Pickled in plum vinegar it turns pink, and it's used as an auspicious item in New Year's osechi cuisine.

In its late-November–December season it is shipped to farm stands within Taketa City.

How to buy Oita's heirloom vegetables

Item	Main sources	Timing
Sorin pumpkin	Farm stands within Usuki City	June–September
Kuju takana	Pickle makers and JA in Kuju, Taketa City; pickles year-round	Late March
Aonaga jibai cucumber	Farm stands within Beppu City	June to October
Usuki's large ginger	Farm stands within Usuki City	Late November
Yasozeri (watercress)	Farm stands at tourist spots in Yufuin and Kuju	March–June
Mitori bean	Farm stands in Nagasu, Usa City	Late July–early August
Yurihonjo City, Nikaho City	Farm stands within Taketa City; plum-vinegar pickles year-round	Late November to December

FAQ

Other regional specialty varieties (3 heirloom fruits)

Item	Category	Growing region	Features
Bansankichi	Pear (winter pear)	Hita City	A highly storable winter pear. November–February
Oita No. 1	Kabosu (citrus)	Usuki City, Taketa City, and others	The leading lineage that Oita Prefecture selected and promoted in 1973 (Showa 48) from Oita's kabosu grown since the Edo period (Oita Prefecture official). Juicy. Mid-August–late October
Chansu	Citrus (dooryard fruit tree)	Taketa City and others	A native citrus passed down in Oita's dooryards. When green it's used as a "vinegar mandarin" whose juice seasons dishes; when ripe, its refined sweet-tartness and aroma make it eaten fresh too

Summary

Oita's heirloom vegetables are a total of 16 items: 13 items passed down across the prefecture—Usuki, Taketa, Beppu, Yufuin, Usa, Kokonoe, Saiki, and elsewhere—and 3 heirloom fruit trees (Bansankichi, Oita No. 1, Chansu). Bungo's own native items such as Sorin pumpkin, Kuju takana, yasozeri, mitori bean, and chorogi remain.

References / information sources

• Japan Heirloom Vegetable Promotion Association, "Oita Prefecture"
• National Agriculture and Food Research Organization Genebank "Native Variety Database"

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