How many days after sprouting should the dome or cup be removed.
@MrTruegreen I remove mine as soon as they pop out of the ground and have never lost a seedling but I keep my humidity at 60% in that room. If you are in a lower humidity environment a couple days in the dome might be better. If you just have a couple you can move them to a small pot and cut the bottom out of a 2 liter pop bottle to make a mini dome. Cut a couple ventilation holes to let it breath but not dry out to fast.
As soon as you see green as long as the room environment is good
You can take it off when it pops out. Or you can leave it on to get a little stetch out of it. Just lightly spray the inside of the dome/bottle