This vintage (copyright J. Baumann 1910) Valentine postcard has a nice collection of Valentine symbols: cupid, hearts, roses, and doves.
Roses are a symbol of love. Today we think of red roses when we think of Valentine's Day. But, roses were not very common on old Valentine postcards. There are many other types of flowers on old Valentines. Most of the flowers are pink. Probably the rose has become more common because the floral industry is able to fly in roses from warm climates. There seems to be a recent trend, however, to give other flowers on Valentine's Day.
Not in my backyard (NIMBY)
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