Nature in Paradise Lost

I am taking English 401 which is all about Milton's Paradise Lost and nature is a very important theme in the book. I think it is really interesting that nature plays such a big role even in older epic works. In Paradise Lost Eden is filled with cedars, pines, and flowers and Milton draws a really clear picture of the landscape. Yet, what is interesting to me is that in nature writing, authors often present nature as something perfect and complete. Something that does not need human touch or that is harmed by the presence of humans. In Paradise Lost, on the other hand, the landscape in Eden is something that Adam and Eve need to improve, they have to take care of the land and cultivate it. So this has left me wondering is nature better of untouched like nature writers think it is, or is Milton right in saying that the wilderness needs human improvement?