Because the Orthodox rules of Kashrut have strictures requiring certain products, such as wine, to be produced by Jews, the leniency of selling one's land to non-Jews is unavailable for these products, since these strictures would render the wine non-Kosher. Accordingly, wine made from grapes grown in the land of Israel during the Shmita year is subject to the full strictures of Shmita. New vines cannot be planted. Although grapes from existing vines can be harvested, they and their products cannot be sold.