Posted: 04/06/2015 at 08:52
I've had similar uncertaintIves this year:
over winter I have kept my tubers dry then put them in dampish compost (see 16april post). Note: dampish, not wet. Have they got too wet and rotted (feel squishy when pressed)? The healthy corm will be quite hard when the sides are pressed - don't press top and bottom or you'll damaged any emerging shoots.
I'm still learning myself, Duchess, and am never sure which of these can delay shooting: compost too old or too new? too dry or too damp? storage conditions too warm etc but it might be just a question of time:
4-6weeks ago only about 70% of my corms had begun to shoot but a more experienced gardener encouraged me to give the slower ones longer: I've now got about 85% success! They are all bursting to be potted up, some lush leafy growth almost 8 inches high. I'm hopefully getting them into their summer homes today - just gearing up my mind for all that potting up.
Perhaps you could separate the 'slow' ones from those which can be potted up and change something for the slow ones - compost perhaps. Then, if they've not rotted, just give them longer. That's what I'm doing.