I found this site and thought I would ask my questions about my daylillys that have changed color this year. I have the woodside amethyst now for the second year. They bloomed purple last year. For some reason this year, they are now yellow. I do have my stella's planted by them and they now look like the stellas. Could they have crossed because of this? What can I do to bring them back? Am I in the future not to mix my daylillies in the same beds?