@Zoia I have also seen daylily clumps stop flowering for a time and during that time they have added new fans more vigorously than during the time that that they were also flowering. It happened to the 'Stella de Oro' (SdO) plants that were grown inside under lights. They would bloom and rebloom repeatedly on average every 60 days. Then after about six to seven months of that they would all stop flowering for about 4-5 months. During that rest from producing scapes they produced more fans, usually multiple new fans per pot. Some of the pots also occasionally produced a new fan during the time that that they were flowering. All the plants were started as single fans in each small 4" pot. All the fans had flowered their last summer outside before being divided and potted.
I checked the growth and flowering pattern with 'Happy Returns' (HR). They were also started with single mature (that is the they had flowered in the summer) fans in 4" pots. Two pots were allowed to set pods on their first scapes. While the pods were developing there were no more scapes and no new fans produced. Within a couple of weeks of the pods maturing those plants produced new fans and scapes and then flowered again very quickly.
I may repeat some of those observations this winter. The SdO and HR plants are still growing in the same pots (since 2019). If I do repeat the observations it will be to check what happens when the size of the pot is larger.
