How did Iceburg Lettuce get to be called Iceburg Lettuce, well according to Wikipedia it go something like this:- Bruce Church founder of Fresh Express, was responsible for popularizing the idea of shipping lettuce across the US continent from Salinas, California to the spots on the East coast. Using ice they carefully covered the heads of lettuce and shipped them all year round and all the way as far as Maine, as the train pulled into each stop, folks would call out excitedly, "The icebergs are coming, the icebergs are coming!" The name stuck. Before that people had to depend on what you could grow locally and preserve from the gardens.
Last but not least is a packet of Cauliflower Early Snowball. A heirloom dating back to 1830 with small to medium, solid white heads.