I am renovating my mother's overgrown gardens. There are a number of large dense clumps of daffodils that do not appear to be producing flower stalks when the others have done so. I am thinking they have become too tightly packed to bloom.
When is the best time to divide them and spread them out? Do I have to wait for them to die back? I am afraid I will forget which ones did not bloom, as other perennials come up and hide them.
I also need to move bulbs that are in places that are about to become brick and stone pathways. When can I start moving them?