*Disclaimer - (I am not recommending in any way, form or fashion that anyone should ever in any way, form or fashion consume any part of any daylily plant in any way, form or fashion. While Hemerocallis (daylily) is a common food and medical substance in Asian countries, if you have never eaten daylily or do not have accurate information on the consumption of daylily, in whole or part, or known-edible forms of daylily, it is completely upon your discretion when experimenting with consuming daylily in any way, form or fashion. I strongly recommend that first time consumers be very careful in the amount of any given daylily they eat in order to observe the effects on their individual and unpredictable systems. Some people have experienced diarrhea from consuming daylily in quantity and some daylilies have been known to have sedative effects, which might be referred to as ‘poisoning’ or ‘poisonous effects’ by some extremely sensitive people. The internal chemistry of each daylily, as well as each person, may vary and so no general information about daylilies as food or medicine can be made that will cover all daylilies and all human reactions/interactions with/to daylilies in any given instance. What is perfectly fine for one person may cause the greatest harm to another. In fact, I would go so far as to recommend that you never eat, drink or consumer anything (Hemerocallis or otherwise), in any way, form or fashion, ever, as doing so may cause unforeseen problems ranging from a disagreeable taste in the mouth to instant and total death (though no death has ever been documented from Hemerocallis and people the world over do eat and drink a wide range of things). If you do seek to consume Hemerocallis in any way, please consult a physician, your pastor or religious leader, local law enforcement, three or more philosophers, a dietician, politicians from your party of choice, multiple Facebook groups and a bevy of Twitter trolls. What you put in your mouth is your problem, and not mine.)
The outer shell of the bud is made up of the three outer petals (called sepals) of the flower. At the very least, there will be roughness on these and they can get very malformed due to this predation on susceptible plants. Buds that are ‘loose’, not tightly closed and perhaps partially open at the tip the day or two before the bud opens can allow these insects to get inside the flower and feed on the inner surface before the flower opens. It is my experience that while there are cultivars showing resistance to these insect predators, there seems to have been very little selection for this trait in the hybrid cultivars, probably because the majority of the wild species also show considerable susceptibility to these pests. However, there is resistance in some small number of hybrids and my own breeding work suggests that this resistance is heritable and can be intensified through crossing resistant individuals and selecting for the trait.
Another point about all those mentioned above is that they can be grown throughout a wide range of climates. Daylily cultivars are registered as ‘dormant’, ‘semi-evergreen’ and ‘evergreen’. These categories are very loose and are not botanical descriptions, but are hobby shorthand. While some think these are hard-and-fast categories there are no true, binding botanical rules as to what gets registered how, and so they are not reliable guides. However, plants having leaves that die in fall and then form a resting bud may require some cold and many of these fail in southern gardens. Some plants retain some amount of foliage, green, above ground throughout the winter regardless of climate and only vanishing to or near the ground when they are frozen off. Many of these are hardy in cold climates, but others are tender and are harmed or even killed by freezing conditions.