Asagao, morning-glory is a typical summer flower here. Japanese sweets served at a tea ceremony usually represent the season. Asagao is often used as a summer theme for the sweets.
The flowers open only in the morning and close in the afternoon. Now elementary students often grow this flower during their summer vacation as a part of school assignment. During the Edo period (the 17th to the mid-19th centuries), samurai, feudal warriors competed to grow morning-glory. They even bred to create more beautiful or rarer patterned flowers.