Q.Daylilies. . .professional Planted, Perfect Soil And Irrigation Regiment, 6+ Hours Of Sun Each Day. . .all Producing Beautiful Flo
wers. . problem is, I must get 6 flowers of each \”stalk\” but only half truly open up. . .what should I do

Certified GKH Gardening Expert
You may try to give it just a little more phosphorus and potassium. There may be a little too much nitrogen in the soil to allow for proper flowering. Fortunately, you can test for nutrient issues and pH issues to ensure that
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/testing-soil.htm
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/soil-ph-plants.htm
Alternatively, there are a few diseases that could cause the flowers to fail to open, such as crow and root rots, and Gall midge.
Here is a collection of articles that will offer more information: