This tells me only of a full-grown vineyard. Whence do I derive (the same for) one with a few fruitful vines? From ("the produce of) the vineyard" — any vineyard. If one trains a grapevine onto seeds, even for (a distance of) one hundred ells, the grapevine is forbidden. This (verse) tells me (that it is forbidden) only in a fruitful vineyard. Whence do I derive (the same for) one that is not fruitful? From "the vineyard" — in any event. This tells me only of your vineyard. Whence do I derive (the same for) the vineyard of others? According to R. Yossi, from "the vineyard" — in any event. "lest tikdash the fullness of the seed": lest there be forbidden.