They will eventually get tall the trimming on top will make them fill in faster. But they are planted close together. This plant can get up to 60 ft tall and 8 to 12 wide. The spacing he did is more like you would do for Green Emerald. Spacing for Green Giant even for a barrier wall is more in the 5 to 6 foot apart area.
http://www.thujagreengiant.net...
