Hikimi wasabi

Hikimi Wasabi () is a variety of wasabi cultivated in Hikimi Town (now part of Masuda City), Shimane Prefecture, Japan.
Wasabi cultivation in Hikimi began in 1818 and by the early Shōwa era (1926–1989) reached an annual production of 300 metric tons (330.7 US tons). Of the wasabi from Shimane, 90% came from the town of Hikimi
At the time, Shimane Prefecture was one of the top producers of wasabi in Japan. The two top areas of wasabi production were Shizuoka Prefecture in the East and Shimane Prefecture in the West. Hikimi's wasabi production declined due to numerous factors, including two large floods since the 1970s, recent generations of farming families choosing different careers, and global warming. In recent years, new residents of Hikimi have been attempting to revive the production of Hikimi wasabi. In 2013, Shimane Prefecture produced 74.5 metric tons of wasabi (70.2 metric tons were soil-grown wasabi, 4.3 metric tons were water-grown wasabi). That is fifth most in Japan, but far behind the top 3 prefectures: Shizuoka (867.6 metric tons), Nagano (604.7 metric tons), and Iwate (432.7 metric tons). Shimane Prefecture is known for its Hikimi wasabi. Due to this small amount, Hikimi wasabi is now considered to be fairly rare.
Climate.
Japan, except for the Hokkaido region, is in the subtropical high-pressure belt, a unique area in the world rich in water despite being located at a latitude which often is desert. When winter comes, rainfall often turns into snowfall, and the Japan Sea side of the main island Honshū has one of the highest amounts of snow at that latitude or lower in the world. Hikimi is located in the southwestern tip of this heavy snow fall area in Japan. Snow acts as insulation to help protect wasabi from frost during the winter. Snow also functions as a natural dam, keeping water plentiful, which is good for growing wasabi. Hikimi is also humid and, being in the mountains, has fewer daylight hours throughout the year. A species native to Japan, wasabi was originally distributed mainly around the Japan Sea side of Honshū. It grows much better in areas with high humidity and short daylight hours than in areas with strong sunlight and high temperatures. With all these favorable factors existing in Hikimi, wasabi grows naturally and has been used by the local people since before it was farmedIn terms of climate, Hikimi is the best place for wasabi cultivation, but there are concerns about the future of wasabi production in Hikimi. It is said that the average global rise in temperature is 0.68 °C per 100 years (1.22 °F), but the temperature of Hikimi rose 1.1 °C (1.98°F) in the past 100 years. This means that ideal conditions for wasabi cultivation rose 200 meters in that time, since temperatures decrease at a rate of 0.55 °C per 100 meters. In the past, top-quality wasabi could be harvested even in the lower areas. However, the water temperature gradually has been rising since World War II, and the warmer temperatures have resulted in more damage to the crops from insects. Some farmers are trying to avoid disease and pests by farming fields at higher elevations, but soon they will run out of land to move up to. Moreover, on the Japan Sea side, in recent years there have been torrential rainstorms at a scale never seen before. These large storms wash away wasabi plants and sometimes devastate entire farms.
Cultivation.
Water-grown cultivation.
In Hikimi, water-grown wasabi is commonly grown on farms in the "Keiryū" style (, ', "mountain–stream style"). The water comes from the Takatsu River system, which is one of the cleanest rivers in Japan. The Tatami-ishi style ( ', "paving-stone style") is the main style used in Shizuoka, and the Heichi style ( "", "flatland style") in Nagano. These use spring water as a source and are usually constructed on a large scale using heavy machinery in easily accessible locations. On the other hand, "Keiryū"-style fields use water mainly from mountain streams. The fields are built on a small-scale by hand along mountain streams, making full use of the natural features of the landscape. To access the Keiryu Style fields, people need to be excellent mountain hikers, because the fields are located in difficult to access places
Water-grown wasabi traits.
Slow growth.
Slow growth owes to "Keiryū"-style cultivation being exceedingly connected to the natural environment. The temperature of spring water (ground water) has little variation year-round. On the other hand, mountain stream water is always exposed to the elements, so the temperature is easily affected by the outside temperature. For that reason, the water temperature in "Keiryū"-style farming changes significantly according to the season. The water temperature range to grow wasabi is as narrow as 8 to 18.6 °C (the ideal temperature is 12 to 13 °C), and growth stops if it is higher or lower than that. Therefore, water-grown wasabi in "Keiryū"-style fields goes through periods of growth and rest similar to annual growth rings on trees.
Flavor and appearance.
The flavor and appearance of Hikimi wasabi are described as: 
Regarding this sweetness, Hoshi Norimitsu, a former executive chef of the Hotel Okura, stated: "Hikimi Wasabi is not only posses a strong pungency, but also contains sweetness in the sharpness. I think it is because Hikimi wasabi spends time in snow. Well ... people have said for years that Japanese radish (daikon) which is preserved in the snow is sweeter. Wasabi is the same."
The viscosity of wasabi is believed to help retain pungency and flavor compounds after being grated, and keeps its quality longer. At the same time, wasabi goes well as a sushi topping or in a sushi rice ball. For example, watery sushi toppings such as herring roe or abalone easily slide from a sushi rice ball, but wasabi makes sushi toppings hard to slide down. Viscous Hikimi wasabi works especially well.
Regarding the color of grated wasabi, residents of Tokyo prefer the deep green wasabi produced in Shizuoka Prefecture, whereas residents of the Keihanshin region (the Kyoto–Osaka–Kobe area) prefer the light green wasabi produced in Shimane Prefecture. The largest company of processed wasabi manufactures and sells two different colors of powdered wasabi for business use. One is the western Japan style, and the other is eastern Japan style. The western Japan style of wasabi is lighter colored than wasabi from eastern Japan.
Farm-grown cultivation.
Farm-grown wasabi is mainly grown on the slopes of forests where broad-leaved trees grow. The broad-leaf trees naturally adjust the sunlight suitable for growth of wasabi by blocking strong sunlight in the summer, and allowing weak sunlight through after the leaves fall in the winter. The fields are made at various altitudes from 250 meters to 1100 meters above sea level. By farming at different altitudes at the same time, farmers can harvest over a wider period of time.
Revival efforts.
To revive wasabi cultivation in Hikimi, the following institutions and measures are being conducted.
Breed varieties.
Shimane is one of the main breed varieties and is cultivated in both water fields and soil fields. Shimane was developed by Dr. Yokogi Kuniomi of Shimane Prefecture's Agricultural Experiment Station with the cooperation of Kenjirō Tanaka, a farmer in Nichihara Town (now part of Tsuwano Town) in 1942. It is the only superior variety found to be resistant to the putrefaction disease which destroys wasabi cultivation, and it saved the wasabi industry in Shimane Prefecture.
For water-grown wasabi only, in addition to local species native to Hikimi, there is Daijin, which is bred from native varieties from elsewhere in Japan.
Misawa, which was developed in 2002, is used for soil-grown wasabi only.
Processed products.
Processed products of water-grown wasabi include additive‐free wasabi paste, Japanese yam paste mixed with wasabi, sausages containing wasabi, and other things. Soil-grown wasabi is used mainly to make wasabi paste. Soil-grown wasabi's leaves, stems, and flower parts are also used as ingredients of pickled products such as "shōyu-zuke" (soy sauce pickles), "sakekasu-zuke" (pickles in sake lees), "miso-zuke" (miso pickles), and sweets such as ice cream and pudding. Wasabi shoots (known locally as "ganime") with good texture are used especially for "shōyu-zuke".
Culture.
Yamaoi-Tengu-Sha shrine.
Yamaaoi-Tengu-Sha shrine is the only shrine dedicated to wasabi in which wasabi farmers pray for a good harvest in Japan. The shrine is located halfway up Mount Daijingataki, 1170 meters (3838 feet) above sea level, in the town of Hikimi, Mikazura District. This town is regarded as the birthplace of Hikimi Wasabi. The shrine's "goshintai" (object of worship) is a carved "tengu" with a round fan dedicated to the shrine.
Wasabi Kagura.
Iwami Kagura is a traditional performance art of western Shimane Prefecture. In modern times, a Kagura play has been created by locals to pray for a good wasabi harvest. Nishida Tamotsu created the wooden masks. Watanabe Tomochiyo, who is a researcher of Iwami Kagura and ethnology, created the words, and the Mikazura Kagura Preservation Society, all members of which are wasabi farmers, created the choreography. The title "Yamaaoi Tengu" was named after the official name of the Wasabi Shrine. The performance was first performed at the Shrine on June 5, 1983. The Wasabi Kagura has continued to be performed since then. The story goes that a tengu, an object of worship of the shrine, slays disease and insects (in anthropomorphized forms) to save suffering wasabi farmers. 
The story is performed by members of the Mikazura Kagura Preservation Society. The group has been designated as a Shimane prefectural intangible folk cultural property. The story is performed at a unique Rokuchōshi tempo.
"Uzume-meshi".
Cuisine using wasabi has existed in the town of Hikimi since the Middle Ages. Most notably, "uzume-meshi" was selected as one of the "Five Great Japanese Rice Meals" in a nationwide survey of local cuisine, conducted by the Imperial Household Agency. "Uzume-meshi" looks like a simple bowl of rice, but when the rice is removed with chopsticks, chicken, taro, burdock, carrots, nameko mushrooms, and other ingredients appear in a broth under the rice. "Uzume" means "to fill up", and "meshi" means "rice". It is said that "uzume-meshi" was named after how the dish is arranged. In Hikimi, it is said that Uzume-meshi was eaten as part of a feast when guests visited a house for ceremonial occasions, such as visits from bureaucrats, festivals, or the New Year's holiday. Its origins are unknown, but there are three origin stories:
The ingredients vary in homes and restaurants, but the common elements are "shirukakegohan" (rice mixed with broth) and wasabi. "Uzume-meshi" is served at local restaurants, and is also provided at the rest stop of a local bicycle race, Masuda I・NA・KA Ride. Riders can ride through the 100 kilometer course, starting from the Iwami Airport runway and passing through various local roads without traffic lights. Uzume-meshi appeared in the Japanese comic series "Oishinbo".
Mascot.
In 2011, the mascot Wasamaru, inspired by the shape of wasabi, was designed as a promotional tool for settlement in Masuda city.