Kikuimo, commonly known as Jerusalem artichoke, gets its Japanese name from the chrysanthemum-like pattern visible when its tuber is cut open. It is a perennial plant belonging to the sunflower genus of the daisy family, and its underground tubers are eaten as a vegetable.
In Gifu Prefecture, kikuimo is cultivated mainly around Ena City and is typically harvested in November. It is particularly popular as a pickled food, including varieties seasoned with miso or fermented sake lees. Its crisp, crunchy texture is one of its most appealing characteristics.
Recognizing its role in preserving local food traditions, Gifu Prefecture has designated kikuimo as a Hida and Mino Traditional Vegetable and encourages its production.
Full-scale cultivation of kikuimo began around 1987 in Iwamura, Ena City, where the sandy soil proved suitable for growing the crop. Miso-pickled and sake-lees-pickled kikuimo have since become well-known local specialties.
The tubers grown in Japan have a knobby, irregular appearance somewhat resembling ginger. They are also known in some markets by the name “Toppinampo.”
Kikuimo has a unique sweetness, aroma, and texture that may not appeal to everyone at first. However, preparing it in different ways can bring out its distinctive qualities. After peeling, it can be pickled in vinegar, marinated in soy sauce, preserved in sake lees, or simmered in seasoned broth.
Its crisp texture makes it especially well suited to pickling, a preparation method that reflects the region’s rich tradition of preserving vegetables.
Kikuimo’s main carbohydrate is inulin, a type of dietary fiber that the human digestive system cannot break down in the same way as ordinary starch. Unlike conventional potatoes and similar tubers, kikuimo contains very little starch. Raw tubers typically contain approximately 15–19% inulin, although the exact amount varies with growing conditions and maturity. Inulin levels generally reach their peak in late autumn.
Inulin is a storage carbohydrate found in plants of the daisy family and dissolves in warm water. It can be fermented by beneficial intestinal bacteria, producing compounds that support a healthy gut environment. For this reason, kikuimo has attracted growing interest as a food that may contribute to digestive health.
Research has also examined the potential of inulin to moderate post-meal blood glucose increases. However, kikuimo should be regarded as a nutritious food rather than a treatment or guaranteed means of preventing diabetes.
November is the main harvest season for kikuimo. Visitors to Ena City, particularly the historic Iwamura area, can discover this distinctive local vegetable through traditional pickles and other regional dishes.