Adam may eat from every tree.
“Then God said, ‘Behold, I have given you every plant yielding seed that is on the surface of all the earth, and every tree which has fruit yielding seed; it shall be food for you;…’”
Genesis 1:29 NASB
There is one tree from which Adam may not eat.
“… but from the tree of the knowledge of good and evil you shall not eat, for in the day that you eat from it you will surely die.”
Genesis 2:17 NASB
Fruit without seeds
The privilege to eat from every plant and tree with fruit yielding seed is given to Adam and Eve at the sixth day (1:29). As the Lord didn’t make an exception here it is correct to read every tree as all the trees on earth and also in the Garden of Eden. However the same day God had spoken to Adam, before the creation of Eve, to not eat from the tree of Knowledge (2:17). So it is clear that the tree of Knowledge didn’t have fruit with seeds and stood apart from “trees which had fruit yielding seed.” This tree couldn’t multiply itself.
Tree of Life
The other tree that couldn’t multiply itself was the tree of Life. After eating from the tree of Knowledge Adam and Eve were expelled from the garden of Eden to prevent them from eating from the tree of Life. Apparently the tree of Life either didn’t produce seeds to be spread over the earth by birds or other animals. If so it wouldn’t have been enough to expel Adam and Eve from paradise: they could eat later everywhere from the fruit of other trees of Life after the multiplication of this species.
Dominion of who?
The two trees in the center of the Garden were of a different kind than all the other trees on the earth producing seeds. Their fruit didn’t have physical but spiritual purposes. Each of the two trees stood for a person. The tree of Knowledge was related with the dominion of Lucifer and the tree of Life stood for the coming Messiah and so these trees were not created for multiplication. Eating from the tree of Knowledge brought mankind under the dominion of Lucifer, the evil one. Eating from the tree of Life was delayed as first a solution had to be brought on earth against sin: the revelation of Jesus, “Truly, truly, I say to you, he who hears My word, and believes Him who sent Me, has eternal life, and does not come into judgment, but has passed out of death into life.” (John 5:24).
Lost Paradise
We don’t know what happened with the two trees after the banishment of Adam and Eve from the Garden. If not earlier they disappeared together with the Garden in the time of the Great Flood. There has always been a remembrance in the common knowledge of man of a lost Paradise. Temples were built on high places among many peoples as signs of that lost Paradise, the first place of divine revelation. The pillars of temples referred to tree trunks, remembrances of the trees in the Garden.
No Bible Contradiction