I just planted "proven winners" daylillies about a month ago. They were beautiful yellow with a deep purple throat. About 1.5 weeks ago, the stem turned yellow brown and there are no more buds. The grassy part is green, but the stems look dead- almost like wood. They get full sun. Not sure what happened and what I should do? Should I cut the stems down? Fertilize? Any suggestions would be wonderful- thank you!!
