I'd like to report an incident
Let me take down the details
Runner Bean Scarlet Emporer is the quickest off the mark.
You'd think it was easy to tell when a seed had emerged? Well, I've discovered beans grumble for a bit before they erupt.
Then they stick their necks out
before lifting their head.
Spot the dilemma:
So, I've decided that (for the purposes of this experiment) a bean seed has only "emerged" once the first two leaves have lifted above the soil level.