What state honors President McKinley with the scarlet carnation?
Early in his political career, Ohio native William McKinley ran for Congress against a horticulturist, Dr. Levi Lamborn. The two were friends, despite political differences, and the horticulturist would send McKinley a scarlet carnation (Lamborn carnation) for good luck before each of their debates. McKinley won and continued to wear the flower on his lapel. Three years after his 1901 assassination, Ohio chose to honor its native son by naming the scarlet carnation its state flower.
Source: Touring Ohio