I love how people give up on the Garden and just make it spiritual. Yes, there is a spiritual aspect, but making the Garde the whole universe weakens the message and allows a person to make it say anything they want.
There was a discussion on which fruit. Only one fruit tree is mentioned by name and it is figs. Now look at ancient fig farming methods. Fig trees have both male and female trees. Only the female tree produces edible figs. The male figs are full of fig wasp larvae and taste bad.
So, people planted only female figs. Then the trees produced no figs. Only when they planted the female figs in a circle with a maximum radius and then planted one male tree in the very center did they get figs. Trees outside the radius were too far for the wasps to fly. Thus, the one tree in the middle gave life to the grove by making it bear fruit, it was the tree of life. The Bible is using this idea to talk about a more spiritual concept of the tree of life. The rest of the Garden is historicall accurate also.