I don't think I am quite understanding what is being asked... if we are talking about record keeping on an already registered cultivar, detailed records shouldn't be needed. Maybe if it's blooming much shorter or taller than registered (which would call your attention to it in the first place), or how a pattern may change appearance from initial bloom to rebloom, or if it has a registered bud count of 40 and you get 10 at best.......details like that can be made without much effort. I think for the most part, though, if you wish to compare your plant against its registered stats, only cursory notions need be made. In a large collection, detailed notations would probably be futile, as stats can change from year to year because of the weather and from garden to garden because of cultural differences.
If a registered cultivar is causing concern, it shouldn't be too much trouble to monitor it for a season, research how it performs elsewhere and then make the decision whether to keep giving it garden space or move it out.
When seedlings come into play is where details are needed and those details need to be accurate *for your garden* IF you are hybridizing and want to control your breeding program(s).
Daylilies are very versatile plants, as are the folks who grow them. How deeply a person wants to go into daylilies is an individual choice. From the harried homeowner that just wants a little color to the dedicated hybridizer that want to build a better (or different) daylily, the effort a person needs to put forth to be successful will depend on their goals.
