Flower cake - Kakou

…After the Northern Song Dynasty, the Double Ninth Festival also became a day to celebrate chrysanthemum flowers, and as the variety of flowers increased dramatically, chrysanthemum pots were displayed in the shape of mountains or towers, and exhibitions were held. Also, since the Tang Dynasty, there has been a custom of eating steamed rice cakes (gao), also called Chongyang gao or hua gao, and people exchanged them as gifts. Today, the Double Ninth Festival has almost fallen into disuse, except for the celebration of chrysanthemum flowers. …

*Some of the terminology explanations that mention "huacao" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…北宋以後，重陽節は菊花をめでる日ともなり，種類の飛躍的な増加とともに，菊の鉢を山や塔の形に陳列したり，展覧会が開かれたりした。また唐代以来，米の粉を蒸して作った菓子〈糕（こう）〉を食べる風習があり，重陽糕･花糕とも呼ばれ，互いに贈答しあった。現在，重陽節は菊花をめでることなどを除けば，ほとんどすたれている。…

※「花糕」について言及している用語解説の一部を掲載しています。

出典｜株式会社平凡社世界大百科事典 第２版について | 情報