I've had some arguments after I assumed ( perhaps wrongly) that electric fields were responsible for the direction that branches grow in. In any case my inquires on this all result in the same answers. That the direction of growth is determined by light and gravity. Do all you agree with this? To me it seems impossible. Branches have a fine structure and they always know how to avoid other branches close by. In some cases two trees will branch out away from each other but will not send branches toward the other tree. Also branches will develop so that they never touch each other. I think there has to be some other force that enters into this. Any commits?