Shimonita Negi: Gunma's Premium Welsh Onion

Shimonita Negi is a traditional vegetable grown only in Shimonita Town, Gunma, and a limited area around it. In the Edo period it was presented to feudal lords and the shogunate as a premium item, and it was also called the "lord's onion." Unlike ordinary long onions, its white part is thick and short with a stubby shape, and while raw it has a strong pungency, heating transforms it into a surprisingly sweet, meltingly soft texture. This one-of-a-kind flavor, nurtured by the area's unique climate and soil, is called the "phantom onion" and continues to captivate gourmets as a taste of winter.

The "Lord's Onion" Loved Even by the Shogun

Shimonita Negi is called the "lord's onion" because its deliciousness made it a premium item presented to feudal lords and the shogunate in the Edo period. It is said that its true quality can only be produced in specific areas around Shimonita Town, and cultivation involves a labor-intensive process taking over a year from sowing to harvest, plus lifting and replanting the crop once. It is a rare, high-quality onion born only through such grower effort and the area's unique environment. That is why it is called the "phantom onion" and prized as a special brand vegetable.

Sweetness and Silkiness Brought Out by Heat

Shimonita Negi's greatest charm is the dramatic change in flavor when heated. Raw it has a strong pungency, but heating instantly brings out a melting texture and rich sweetness. Hot-pot dishes make the most of this trait. Adding it to sukiyaki or to a pot generously using the onion lets you fully savor its sweetness and silkiness. Slowly grilled "yaki-negi" is also superb, letting you enjoy Shimonita Negi's natural deliciousness in a simple way. Its rich, savory flavor that enriches the winter table is unforgettable once tasted.

Highlights and Nearby Sightseeing

In Shimonita Town, you can buy Shimonita Negi at local direct-sales shops and roadside stations during the season. The thick, stubby genuine onion also makes a welcome souvenir. Around the town there are many highlights, including Arafune Cold Air Pit, a component of the World Heritage "Tomioka Silk Mill and Silk Industry Heritage Sites," and the scenic Mount Myogi with its rows of strange rocks. You can enjoy taste and sightseeing together.

Seasonal Fun

Shimonita Negi is in season in winter (late November to around February). Because frost further increases its sweetness, the harshest cold is the eating time. In this season, local events themed on the onion are sometimes held, drawing people seeking the seasonal taste. You can also enjoy winter-only scenery such as views of a snow-dusted Mount Myogi.

Access and Essentials

The gateway is "Shimonita Station" on the Joshin Dentetsu line. Head toward Shimonita by the Joshin Dentetsu from Takasaki Station, or by car the "Shimonita IC" on the Joshin-etsu Expressway is convenient. Since the hours of direct-sales shops and restaurants and the arrival of Shimonita Negi vary by time, checking in advance is reassuring if you want to be sure of tasting the seasonal flavor.

Practical Travel Notes

• Shimonita Negi is a winter-only delicacy. Aim to visit during its season from late November to around February. Off-season you may not encounter the genuine onion.
• Direct-sales shops and roadside stations may have limited quantities. If you want to be sure of getting some, an early hour is recommended.
• Since it is pungent raw, buy it as a souvenir on the assumption of cooked dishes. Sukiyaki and hot pot pair especially well.
• Winter in Shimonita is cold. Prepare well against the cold, and if driving, watch for frozen road surfaces.

A Word of Advice

Shimonita Negi is a winter star that shows its true worth only when heated. To cap off your trip, savor a locally made hot pot or sukiyaki with its melting sweetness, and take the genuine onion home as a souvenir. Touring it together with nearby Tomioka Silk Mill and Mount Myogi makes for a rich Gunma trip that combines taste, history, and spectacular scenery.

📚 Sources

The content here is organized from official tourism information on Shimonita Town, public information from direct-sales shops and roadside stations that handle Shimonita leeks, and on-site guidance. Shimonita leeks are a winter-only delicacy, and the season and the hours and stock of shops change. Because fees, hours, and access can change, please confirm with official sources before you set out.

Visitor Checklist

• Time needed: One to two hours for shopping and dining at shops and roadside stations, or about a half day with nearby sightseeing.
• What to bring: Winter in Shimonita is cold, so prepare warm clothing, and watch for road ice if driving. Cash is handy for shopping.
• Suggested route: Visit direct-sales shops and roadside stations in season, taste dishes made with Shimonita leeks, and buy some as a souvenir.
• Timing guide: Shimonita leeks are a winter-only delicacy, so aim for the season from late November to around February. Stock may be limited, so visit early to be sure of getting some.
• Cooking guide: Raw, they are quite pungent, so buy them assuming cooking. They pair especially well with sukiyaki and hot pot.

Practical Information for Your Visit

• Roadside Station Shimonita: Open 8:30-18:00 (the restaurant Orenji is open 11:00-18:00). Closed on the 2nd Tuesday of each month (the following day when that Tuesday is a public holiday). 3766-11 Oaza Mayama, Shimonita-machi (0274-82-5858)
• Parking and access for the same station: 100 spaces for small cars, 19 for large vehicles and 2 for visitors with disabilities. It is about 1.5 km, or 2 minutes by car, from the Shimonita IC on the Joshin-etsu Expressway
• When shipping opens: The Shimonita Negi no Kai, a producers' group of about 60 households certified by Shimonita Town, has laid down seven rules that must be observed, and shipping in the green boxes is permitted from December 1
• Konnyaku handmade experience dojo: 390-1 Oaza Shimonita, Shimonita-machi (0274-67-7500 / reception 9:00-16:00, closed on Wednesdays). The session takes about 60 minutes and costs 3,300 yen per person for individuals (2-19 people) or 1,650 yen per person for groups (20 or more). Capacity is 2 to 120 people, and a reservation must be made at least 7 days in advance
• Shimonita Negi Festival: In Reiwa 7 (2025) it was held on November 23 from 9:00 to 15:00 in the plaza in front of the konnyaku handmade experience dojo and along Nakamachi-dori street
• Access by the Joshin Electric Railway: The one-way fare from Takasaki Station to Shimonita Station is 1,130 yen. Shimonita Station has a paid parking lot with 38 spaces, and free rental bicycles are also available

Note: The dates of the Shimonita Negi Festival for 2026 (Reiwa 8) have not been announced. Stock levels and sales periods at the individual direct sales outlets for Shimonita negi are not published either. (Sources: Shimonita Town, Shimonita Town Tourism Association, Roadside Station Shimonita, the konnyaku handmade experience dojo, Joshin Electric Railway)