I have planted a hedge 100' feet long that consists of two staggered rows of thuja plicata spaced 2.5' apart and each tree spaced 2.5' apart. They are now approximately six feet tall and I have not done any pruning to date. I am thinking I need to start do some pruning so that it will be a thick hedge. When mature, I will want the hedge to be approximately 7' x 7' tall. I am thinking I should prune the end of branches protruding out from the trunk so that they are not more 12 - 15" from the trunk. I am thinking this will make the side shoots / branches grow out / thicken. Am I on the right track? I am thinking of doing this in April to take advantage of this year's new growth. I know this species of a hedge is always going to be work, but I wanted to use the seedlings of native species that were growing on my property (5 acres).