“ Connected grafted shoots of vines, and [regarding] grafted, vine shoots, growing on other grafted, vine shoots, even if he rooted [and planted the middle section into the ground, it is not viewed as newly planted and its fruit] are permitted. Rabbi Meir says: In a case where the potency [of the graft] is strong [and it draws its nourishment from the mother vine] , it is permitted, but where the potency [of the graft] is weak [and draws its nourishment from the rooted middle of the vine] it is [considered newly planted fruit and is] prohibited. ”