Let's take a look at that lettuce you buy in February:
An estimated 85 percent of the lettuce available for consumption in the United States was produced domestically in 2022. While production of lettuce occurs year-round, areas of production shift with the growing seasons. From mid-November through early April, most lettuce sold in the United States is sourced from the irrigated desert valleys of Southern California’s Imperial County and the Yuma area of Arizona.
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Arizona
Heaviest Peak: May – July; December
Predominant Crop: Lettuce
Arizona is known for its plentiful sunshine and arid climate, making it a great state to grow leafy vegetables all year long. It produces lettuce in the largest capacity, followed by melons, spinach and cauliflower. Inverse to most of the agricultural belt states, Arizona’s peak crop production happens when much of the rest of the country is cold. This is when the temperatures are most moderate in the state and conditions are best for growing. Produce-influenced rate and capacity fluctuations begin in spring, carry through to mid-summer and pick up momentum again in December.
One of the blogs is put out by the state of California. If you've ever driven through a region of the country where produce is grown you will see for yourself how many workers are in the fields. In my home state of North Carolina, cabbage, tomatoes, and squash are some of the main crops grown and if you drive through the eastern part of the state in the summer and early fall, you will see dozens of workers in each of the fields you pass and this goes on for miles and miles.