America's broccoli supply may have a geography problem.More than 90% of fresh broccoli grown in the United States comes from California, leaving the popular vegetable's supply chain particularly vulnerable to drought, according to new research.Researchers at Cornell University examined how drought conditions in California could affect broccoli shipments and whether increasing production on the East Coast could help protect the nation's supply.SEAWEED-BASED COATING COULD KEEP STRAWBERRIES FRESH FOR DAYS WITHOUT REFRIGERATION, STUDY FINDSThe study, recently published in the journal Agribusiness, used historical shipping and drought data to model the broccoli supply chain under normal, moderate-drought and severe-drought conditions.Researchers estimated that California broccoli shipments could fall nearly 9% during moderate drought and more than 20% under severe drought conditions.More than 90% of America's broccoli supply comes from California, according to a recent study examining the popular vegetable's vulnerability to drought.(Sandy Huffaker/AFP via Getty Images)However, Christopher Valadez, president and CEO of the Grower-Shipper Association of Central California, cautioned against interpreting the latter figure as evidence that California has previously experienced such a collapse in supply.The roughly 20% figure is "a statistical average" produced by correlating historical monthly shipments with periods of higher drought-index readings between 2000 and 2019, Valadez told Fox News Digital.CLICK HERE TO SIGN UP FOR OUR LIFESTYLE NEWSLETTER"It is not a record of any single year in which the national broccoli supply collapsed by that amount," he said.California's coastal growing regions have continued supplying the majority of America's fresh broccoli through multiple prolonged droughts by adapting irrigation, crop management and planting decisions, Valadez noted.California has been able to continue supplying the majority of America's fresh broccoli because of str...