Topping off Pine trees
I have seven fully grown pine trees (30') in my backyard. They are very mature and nice looking trees. They provide very good privacy to the house. The problem is that there is a high tension power line going behind my house that is above these trees. The power line company wants to remove these trees so that they don't have to worry about trimming them periodically.
I asked the power line co. if it is possible to top off the trees and not remove them. They are instead offering me to replace them with shorted ornamental trees (max height of 20').
What I need to know is if pine trees are topped off, do they grow vertically? If they only grow sideways the power company doesn't need to worry.
If these trees are topped off, are they likely to be disfigured or die?
I would really hate to lose these trees and wants to do everything possible to keep them. Any advice would be much appreciated.