In a past few days weather in Japan has dramatically changed. The temperature has dropped suddenly from 22c high to 14c high.
Some typhoons and autumn rain systems brought that "winter-like autumn".
While germination of komatunas seems to delay my winter vegetables like Chinese cabbages (Hakusai) and cabbages might welcome the cold weather. They need cold temperature to roll their leaves inside for protecting themselves from coldness, which is an important process of growth.