Genesis 2:9

"And the Lord God made all kinds of trees grow out of the ground-trees that were pleasing to the eye and good for food.  In the middle of the garden were the tree of the life and the tree of the knowledge of good and evil."  Genesis 2:9

It's interesting here that God didn't just put trees that were edible or had edible fruit, but he also put trees that were purely decorative.  The Qbible translates that God planted every tree that is pretty and every tree that is good for eating in the garden.  So every type of tree was in Eden.  Then in the center of the garden were the two special trees.