[I got really confused. Those two are not chrysanthemum but dandelions but the story below went on with that confusion. Sorry... - edited after posting]
Autumn is the season of the chrysanthemum. Not just the beauty of flowers or fragrance but their long life are the reason why I love them. Some of them last couple of weeks in the vase, which will be the reason why they use chrysanthemum as a decoration during funeral rites in Korea as they hold ceremony for 3 days(99%).
Say a person passed away at 11:59 P.M., then the ceremony holds 32 hrs. Because that very one minute before the midnight is counted as one day and they carry the coffin out for cremation or burial at 7 or 8 A.M. on the third day morning.
You can see the worst case is the death at 0:01 A.M., which means the ceremony will go on for 32+24 hrs - 1 minute. It's quite a burden for the family.