When our daughter took on an allotment with her partner, we did warn her to be prepared for some disappointments, from the weather, or deer, or pigeons - not everything we plant ends up on the plate.
I just had a reminder too that things don't always go well, and it's my fault.
Because the all the window sills were full I put some trays of beans (french and runner) in a greenhouse, which has just enough heat to protect from frost (and it was down to -1.2 Celsius air temperature here last night). There they have sat for a couple of weeks doing hardly anything. Out of 4 trays only 3 seedlings have appeared and the seed parts, as they emerge, look brown in parts, I think they have just been lying there too cold and in danger of rotting.
So now I have put two in a warm propagator and two on a by then vacant window sill. So, fingers crossed!