I have a liriope (white) I don't see many of these out there at the local garden centers. I am looking at splitting the plant I have. Should I pull it out of the ground and split it now, and do I leave the plants outside, or do I keep them say in a 3 season room that gets plenty of light? Do I wait until spring? I've never taken root cuttings before would this be a better way and how do I take care of those?