I planted 3-4’high thuja green giants last spring 5’ apart. And they are growing like weeds, so the conditions are good. I want the trees to grow to their full height for a screen from my neighbours. AT the moment the trees are sparse and I would like to thicken them up. I understand that pruning the tips back while maintain a conical shape is important. But, do I cut back the main leader?
You are not the first to wonder about how to prune these friendly green giants. Here is the full response we provided to an earlier inquirer. Thuja ‘Green Giants’ pruning
Good luck with your spring pruning!