I don't remember when or where or how many I bought, but for sure they have been in the garden for several years. They have just finished flowering this spring, as a congested clump of soft yellow and white flowers. I am concerned that they are overcrowded. So my question - when do I dig and divide? Should it be right now while the foliage still looks good and they are easy to find. Or should I wait until the foliage begins to yellow off, indicating almost dormant. Waiting until they are invisibly underground makes such activities fraught with danger - sliced bulbs. Or am I better off leaving well enough alone and not disturbing them at all. Thanks for the good advice from Judy in New Jersey where all the world is green