As a winter is coming to Osaka, the temperature down gradually recording 15C high and 8~9C low, which would be welcomed by my Chinese cabbages (Hakusai), white radishes and cabbages but not by young komatunas since they need warmth in the air for their growth
I set up a vinyl shelter for them to prevent cold winds and keep the air inside warmer. When I put my hands into the shelter I could feel the air getting warmer so I can expect it could be helpful for my komatunas. The rice husks which I mentioned in the previous post seem to be effective for expediting the growth of komatunas judging form their germination rate and growth.
-- from iPad