Look at a map of wine producing regions in Europe. Today wine production ends in west Germany and only really starts again in south-eastern Czech Republic - with some tiny local exceptions. In the middle ages, wine was grown in that gap too. And people start doing it again now.
What does east have to do with that? FYI wine is still grown north of Prague, on Czech-Austrian border, in Slovakia, Hungary, Moldova, Georgia…
Look at a map of wine producing regions in Europe. Today wine production ends in west Germany and only really starts again in south-eastern Czech Republic - with some tiny local exceptions. In the middle ages, wine was grown in that gap too. And people start doing it again now.