It’s been some time since I wrote an update on the giant onions; they are not doing very well at all.
I have had all the windows open in the greenhouse so they have had ample air flow. I have also tried them in the propagator inside the greenhouse incase they were getting too much sun. I have left them to dry out and I have also sat them in a thin layer of water. Everything I try is leaving the seedlings white at the tips and then simply keeling over and dying.
After doing at little research on this it looks like no matter what I have tried they have damping off disease. From what I have read, it is possible to combat this with placing ground cinnamon around the seedling as this kills the disease. I am not convinced but have given it a try.