northern pines

Question

Can I cut the top of northern pines when they get too high?

Answer 1

Topping or pruning off of a Pine Tree will not stop the upward growth of your trees.
A new branch will take over as a leader and the growth can be pretty quick.
You will need to continue to top the tree every few years.

These cuts can create a site for disease.
This link has more information for you.

http://www.cals.uidaho.edu/edcomm/pdf/bul/bul0644.pdf