The phrase "farm wineries" refers to wineries or vineyards that are located on a farm. It means that the wine is made from grapes or other fruits grown on that specific farm. Full definition
Disembark at Olive Farm Winery for fine wine tasting at Western Australia's oldest underground cellar. (wikiaustralia.com)
That measure is a more comprehensive set of reforms that would build upon the SLA revisions by allowing farm wineries to consolidate and simplify distilling manufacturing licenses, raise production limits and lower licensing fees for craft manufacturers, expand marketing opportunities, modernize shipping laws, and increase retail outlets where small craft manufacturers can sell, serve and offer samples. (suffolktimes.timesreview.com)