Although I'm not specifically hybridizing for "blue", I do have some blue tones in my light lavender introductions. A very wise hybridizer once told me that you cannot possibly have a "true blue" eye zone if the petals of your daylily are a "muddy" color because the same mud that is in the petal is putting mud into the eye zone. That's why you see a lot of blue eye zones described as "slate blue" rather than true blue. So when I look at photos where someone claims to have a "blue" eye zone, my eye goes immediately to the petal color and clarity. I think to achieve a really clean, true blue you must work with flowers that have clean, clear colors to start with!
