The wilds of the woods; have naturally the ruthless
competitions, for space, food etc. that only allow a few of the best to
survive, as other jungles. This maintains the strongest, luckiest,
most dominant within a species; even as a species (trees) as kings of the
given jungle, even within the same tree, singular dominance works.
As a limiting feature, when trees are tall enough to be drowned in light
as they reach out of the canopy, they have more of a codominate fault/
non-singular dominance as now by ratio competition for light is suddenly
less. For the light has increased in that ratio. The resulting
too many dominants/codominates; then can set the strength of the physics
of support against itself. The house divided, does not stand as
well, and the codominates split, limiting height etc. Too much mulch
can be bad, too much water; even too much light.