In Izu City, high-quality shiitake mushrooms have traditionally been produced through log cultivation. Log-grown shiitake mushrooms are thick and rich in flavor and aroma, with dried shiitake mushrooms consistently winning awards at national evaluation contests. There is also a record stating that the artificial cultivation of log-grown shiitake mushrooms was first conducted in Japan by Seisuke Ishiwata in the Monnohara area (now the Yugashima district of Izu City) in the first year of the Kanpo era. To ensure safety and trust, these mushrooms are named “Seisuke Shiitake” after Seisuke Ishiwata, and the highest quality mushrooms are branded as “Seisuke Donko.”