How do trees decide when and where their branches grow?

Question

How do trees decide when and where their branches grow?

In: Biology

Answer 1

Also an added question to this, how/why do trees grow around powerlines? In my city we have powerlines and the tops of the trees have grown in a semi-circle around the lines. It doesn’t look like they’ve been cut, nor have I ever seen them do work to the trees. They just seem to, grow.. around the lines..