Originally posted by stvlepore:

There is no second chance, once you plant them too close you lose them. Same with trees.

True if you've planted two trees (or carrots) close together. But it might also be the case that you're put a tree too close to a rock (that you can get rid of with a pick axe) or maybe you've planted a carrot too close to a fence- you could save those carrots by moving the wall out.