Currently I can tell the difference by the size of the plants. It goes from largests (1) to smallest (4), which is also the order they sprouted.
I am growing in a 58x58 grow closet, and one seed is pretty far ahead of the others, gonna be fun to see how this works out.
Seedling 4, only just sprouted, but it was also put in dirt long after the others.
Seedling 2 got knocked over doing a watering, and I had to help it get upright. Put some dirt close to the stalk to keep it straight. However, it still has a tilt that I can't seem to correct, and I hope it won't turn into a problem when it gets larger.
I also topped seedling 1 this week.