Last week I did a second planting of lettuce, spinach and mizuna. I spread the work over three days, so it was far more relaxed than the first planting.
Now, 12 days after being planted, lots of seeds are sprouting. For each tray-full of seeds I record the day each seed sprouted in a table like this:
Like before the green cells are lettuce seeds, the orange are spinach and the blue are mizuna. So far the seeds are sprouting in the order we thought they would - first mizuna, then lettuce and finally spinach.