I posted some 1910-1920 postcards of flower vendors in San Francisco a few days ago. These are a bit later - 1930s and 40s, but the flower vendors are still going strong.
By the way, how do you spell the word -vendor or vender? I have heard that vender is the American spelling and vendor is the British spelling, but I hardly ever see it spelled with 'er' here in the United States.
Here are the backs of the cards in the same order.