I to be childish didn't think that a sold plant was dead. The four seasons are in Japan very clearly. The heat of summer is said as more than the tropics. And, the coldness of winter is as much as ice forms and it snows. But, this is the climate of Japanese Kanto district.
Japanese climate varies according to the district very much.
Though Japan is a little country, a zone to the subarctic zone from the subtropical zone is contained. I live in Saitama Prefecture in the center of Kanto district. Here is almost as much as ZONE 9a when it is shown with USDA Plant Hardiness Zone. A coldness countermeasure is necessary for winter, and a heat countermeasure is necessary for summer. I am not good at English.