White chrysanthemums are popular with funeral florists, who use them to spell out tributes for "MUM", "DAD", and various other names or relationships.
Some funeral flower facts for you:
White chrysanthemums are associated with funerals in Eastern Europe and in China, Japan and Korea.
Floral tributes became popular here from the 19th century, partly for their symbolism, but also because they were used, with aromatic herbs like rosemary, to try to hide the smell of putrescent bodies.
After the Hillsborough disaster in 1989, it became increasingly popular to lay floral tributes for strangers at the site of car accidents, murders and disasters. The florists did very well out of Diana Princess of Wales' funeral, when thousands of flowers were heaped in the streets of London.
Some of the nicest floral tributes I've seen were informal ones that had been picked from mourners' own gardens. White chrysanthemums don't lend themselves to informality.