No Weather for a Dwarf Bean

Not unreasonably, thinking that spring might have arrived by now, I sowed some dwarf French beans in February for an early greenhouse crop. They have still to make it to the greenhouse, instead remaining on the kitchen windowsill where they are standing on a heated gravel-filled tray. I would love to say that the reason they are flowering and even setting a bean or two is because I am such a talented gardener, but I think the truth is that the poor things are desperate to set seed and depart this chilly world!