Gardening to absorb heat in summer It's so hot. Resent the highest temperature in the day time is 35 to 37 celsius in Tokyo. Sunlight is harsh. To avoid the heat of the sunlight, people actively grow some green outside of the window in schools, companies, and homes, called "Green curtain". For Green curtain, it is better to use some plants that are tolerant of heat and grow well enough to cover whole the windows. Especially people like bitter gourd as Green curtain because it is "killing two birds with one stone": the plants absorb heat and also the fruits are edible. Bitter gourd is kind of vine, and the fruits are a little bit bitter and used as fries with pork. However, if you grow bitter gourd every summer, you may be getting bored. I recommend Horned melon (Kiwano) as another choice for Green curtain. It is easy to grow in a temperate region, such as Tokyo, you can get many fruits. The fruits have beautiful green jelly with a little bit sour and fresh flavor. I think that this plant is "killing THREE birds with one stone", because the first is absorb heat and the second is edible, and the third is security, that is, it has many small hard spines, and no one can touch the windows.