This tells me only of a vineyard. Whence do I derive (the same for a plot containing) five food plants of five (different) kinds? From "that has planted," (fewer than five not being "planting"). I might think, even four food plants and five barren plants. It is, therefore, written "a vineyard," (these not being considered "a vineyard.")
R. Eliezer b. Yaakov says: I understand the verse as applying only to a vineyard, (and not as five food plants).
"and did not redeem" (in the fourth year): to exclude (from "returning") one who sunk vines. "and did not redeem it": to exclude one who engrafted them.