A week ago I started some lettuce, I did it in ziplock bags as that has always worked well for me. Once it sprouted, I transplanted it into my Grodan starter cubes, they were presoake in 1/4 strength 5.5 pH balanced water per the Grodan specialist.
I then placed the cubes in a mini greenhouse (aka a clear plastic contained that traps humidity) to allow the seedlings to root in some, etc. I have no watered them, the Grodan cubes are not dry. They get about 6 hours of natural sunlight a day. One is looking good the other one is not, it looks grim and is browning and wilting a little. The other never sprouted leaves, just turned brown and wilted.
I have some pics below. Does anybody know what might cause this? Thank you....
Overview of Plants
Not healthy plant?