Thanks for the pics and the explanations.
My experience is: the best and brightest colors in my garden appear after a tropical night (defined in our corner of the world by temperatures of 20°C and above) with soft rainfall on an overcast morning.
But the initial question was about type of soil - up to now I have seen warm and yellowish colors on limy soil in my garden, nearly every near white is yellow, nearly every pink is peach and cold bluish colors. The opposite I've seen on acid soil in the garden of a friend, was a pinewood before turning into a daylily garden. All the yellow and peach ones I gave to him look perfect near white and true pink in his garden.
But there is a different factor in this speacial comparison - I live in a region influenced by mediterranian climate, his garden is in alpine climate.
I also have seen very pale colored daylilies around here in neighbours gardens if it's really hot and nobody waters this clumps. Most of them I grow too and compared with my plants - daily watered by an irrigation sytem - you can see significant differences.
