These postcards are all from J. Von derLinden’s violet business on Mulberry St near/on the fairgrounds. By 1910, there were 116 growers generating over $1m in revenues (check out the Sanborn maps from 1905-1923, you’ll see they were all over the place). Von derLinden sold his interest to Frank Trombini in the 1940’s. The business continued until the 1970’s. First two cards are 1907. Third is undated, likely early 1930s.