Perhaps it is All Temperament

Weather conditions are the same for all of them,
one is no more sheltered than another,
and they are the same age, judging by their size.

I like to think one tree
decides to keep summer a bit longer
and one impetuously responds to
the tide of incoming autumn.

Trees are not remotely like people,
but I reflect that I know some
people who have never let summer go
and others who begin
to think winter thoughts in July.

Perhaps it is all temperament.