I am looking to transplant a number of crocuses in my garden. They are scattered here and there, which is nice, but I am looking to move them and concentrate them in my front garden for greater impact. There is a surprising lack of clarity/consistency online about the right timing for this; I think the general advice is to wait for the foliage to die back, indicating dormancy, and do it then. Others suggest waiting to Fall, but this would only work for me if there is a Fall flush of foliage since I will never remember where they are.

So, anyway, what should I do?