Shasta Daisies and dividing them
I've got a 24-inch wide clump of Shasta Daisies where the center is no longer growing well. I've read up on dividing them and it seems there is much disagreement on when to do this - fall or spring.
I'd like to hear some firsthand stories on success of dividing them and when.
I can wait until spring. I assume I leave the foliage up until then.