I set up some vinyl tunnels 3 days ago for my komatunas which had been suffered from poor germination and I'm very happy to see today how effective they are.
You can see arrays of my komatunas have grown well in the above photo.
I saw much less germination and only smaller sprouts but the growth only for 3 days are so impressive. Fortunately it was very fine through this week, which could make the air inside the tunnels warm.
The first generation komatunas shown above seem to welcome the vinyl tunnels. They have been troubled in less germination and growth but since the tunnels were installed their growth has been so remarkable that I can expect to harvest them in the near future.
-- from iPad