This image shows an expansive field of lettuce located in the fertile Salinas River valley, where much of the U. S. domestic lettuce crop is grown.
The description states:
Of crisp head lettuce being readied to uphold Salinas legendary reputation as “The Salad Bowl of the Nation.”
—Salinas is a city as well as a river and associated valley, and is the seat of government for Monterey County.
This postcard likely dates from the 1950s.