I make seedlings up in trays of 25.
When they get two true leaves (so four leaves total) I plant them in the ground. Sometimes 25 sprout and sometimes less.
When it's less I just tip the soil out on the ground ready to start again as any seed that hasn't sprouted in the time it takes its mates to grow four leaves is probably not going to happen.
Or so I thought.
But check out what I found at the pumpkin patch:
Not one but two pumpkins coming up from discarded seeds. And the pumpkin in the mulch? That is one that was planted the same day. Weird huh? They must have been using Amy time to grow!