Yes, you can replant, but I would wait for a day that isn't too hot or too sunny. I worked in a greenhouse with a family who had owned it for 83 years, throughout generations.Yes, it's more expensive, but the difference is the quality of the soil, the consistency of water and temperature and the general care and pruning the plant receives. If nothing else, buy your perennials from an established nursery. There's usually a year guarantee.