I believe that this poem is referring to the Gardne of Eden. In stansa 5 there is a lot of evidence of this. There are references of red apples and “lest we loose are Edens” when the idea of the Garden of Enden is sergested most of what is being said could be linked to it.
In stansa 3
It says “see the creatures stalking” I believe that this is talking about the snake in the Story of the Garden Of Eden.