California’s tomato farmers are responsible for more than 95 percent of processed tomatoes in the United States. Of all the tomatoes grown commercially on earth, nearly 30 percent is grown in California. It’s a top agricultural commodity worth about $1.18 billion. When it comes to tomatoes, California’s extreme weather is serving up some big trouble for restaurateurs like the Crotti Family. … Five years of drought have created a tomato shortage. Last year, an extreme heat wave late in the season shriveled tomatoes on the vine. This year, heavy winter storms put Central Valley fields under water, preventing farmers from planting on schedule.