In plants, it is just convenient that to make another leaf, you make one
like the last one, and put it on the other side, or rotated around a bit.

The fascinating part of this is that, unless there is some other compelling
force, the leaves and other parts are always put on according to the Fibonacci
principle.
Iris,
Central NY, Zone 5a, Sunset Zone 40
"When you come to a fork in the road, take it." Yogi Berra