Last spring, Carmelo Mendez was pruning peach trees in Colorado on a temporary visa, missing his children and wife back home, but excited about how his $17.70 hourly wage would improve their lives. This spring, he’s back in the Mexican state of Tlaxcala frantically searching Facebook for a job on one of the thousands of farms across the US that primarily employ guest workers like him.

Mendez is one of the more than 300,000 foreign agricultural workers who comes to the US every year on an H-2A visa, which allows him to temporarily work plowing fields, pruning trees and harvesting crops in states from Washington to Georgia, Florida to New York, Texas to California. But as federal immigration policies change rapidly, farmers and workers alike are uncertain about their future.

“Without [this guest worker program], I believe agriculture in the US would decline a lot because people there don’t want to do the work,” Mendez said.

As the fate of the hundreds of thousands of undocumented farm workers remains in limbo amid Donald Trump’s mass deportation threats, and the administration’s H-2A policies are undecided, the future of these guest workers remains unclear. Their numbers grow each year – and they are increasingly central to an industry historically dominated by undocumented workers. The industry isn’t creating new jobs either.

Farmers agree with farm workers like Mendez. They say they cannot attract other workers to their rural fields.

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