As far as I know agriculture works similar in Germany in the sense that it relies on cheap labor. Except, I believe it's mostly legal because they come from inside the EU, making it easier to work here. Also giving them the same rights, in theory at least. In practice it often doesn't work out like that, but that can't be easily changed I guess. Can't imagine they actually get German minimum wage. In that case and in that sense, they actually don't work here legally I guess.

From what I remember, most of them don't migrate though but return to their home country after a season. Back to their families and a country with much less living cost.

Was some time ago that I last read about that topic though.