Horticultural activities in Florida have been chronicled in many sources, including the technical literature and the popular press. One often-overlooked source is the visual images on postcards that were sold in Florida in the early years of the 20th century. Many such cards have images featuring scenes of landscape horticulture, olericulture and pomology. While dates of postmarks may not be accurate reflections of publication dates, deltiology, the study of postcards, can involve the analysis of pigments, rag content of card stock, and other measurable parameters to determine the age of particular images. The introduction, development, ascendancy and sometimes decline of certain horticultural crops in Florida are reflected in postcard images taken between the years 1908-1950. Representative images are shown of past and present plants that have been important in Florida horticulture.