PURPOSE: To enable the cultivation of a Japanese horseradish anywhere without any limitation of places.

CONSTITUTION: Smoked charcoal 2 is spread in a pot 1 and a seedling 3 of a Japanese horseradish is placed on the smoked charcoal 2. The smoked charcoal 2 is newly supplied so as to cover the seedling 3 of the Japanese horseradish. The pot 1 is subsequently vibrated in a state of the smoked coal 2 sunk in water to fluidize the smoked charcoal 2. The pot 1 is then pulled up from the water to fix the seedling 3 of the Japanese horseradish with the smoked charcoal 2. Water is suitably injected in this state to cultivate the Japanese horseradish thereafter.