Many ways people express affection, empathy, sadness, or joy. One of them with flowers. Interests used by people since time immemorial to express feelings.
Certain flowers are even believed to cure disease, but interest is made as a symbol of something in terms of expressing feelings, both grief and likes, depending on the person who interpreted it.
But there is also something that appeals something interesting as a symbol of death or threatens it also depends on the person who interprets it.