Morning glory
朝顔 asagao

Opening at dawn and fading by midday, the morning glory stands for the fresh, short-lived beauty of a summer morning. A craze in Edo gardens, it became a favourite on yukata, tenugui and fans for July and August.
China, brought as a medicinal plant in the Nara-Heian period
Introduced from China as a medicine (its seeds are a purgative), the morning glory became an ornamental flower in the Edo period. Crazes for odd 'changed' varieties (henka asagao) peaked in 1804-30 and again in 1848-60, and the flower spread onto combs, tenugui, uchiwa fans and kimono. Its fading by midday also tied it to the Genji chapter 'Asagao' and to poems on passing time.
A summer pattern worn in July and August; the Iriya morning-glory fair in Tokyo keeps the Edo craze alive each July.