Sorry, my prior entry, San Antonio Rose, didn’t count: “It must be a true floral reference-- e.g., “Rose” used as a female name doesn’t count.“
Here is a reference to flowers from an Academy Award winning song, in the first musical production of State Fair, “I haven't seen a crocus or a rosebud or a robin on the wing”
And, from an audition for the same role by a then unknown sophomore at Northwestern, for un updated movie version in 1961, but with the setting moved to the Texas State Fair from Iowa ...
.. who they decided to make the entertainer in the movie instead
More about writing of the song It Might As Well Be Spring