The United States H-2A "guestworker" visa program allows farmers to hire workers from other countries to fill temporary/seasonal positions when local workers aren't available.
In this 2021 article in Growing For Market, Gretel Adams from Sunny Meadows Flower Farm in Columbus, Ohio describes how the H-2A program has worked on their farm.
In this 2023 episode (#7) from the Growing For Market podcast, Gretel and Steve Adams elaborate on the topics covered in Gretel's 2021 article, describing the benefits, commitments and responsibilities of having H-2A workers on their flower farm, where approximately a third of their 24-person crew this past year were H-2A workers. The episode also includes information about who the program is for, how to enroll, considerations to ponder when deciding whether to do the paperwork yourself or hire someone to do it for you.