We have 10 Green Giant Arborvitaes between the neighbors front yard and ours. They are currently about 4' tall, and we'd like to cap the height of the hedge at 5 1/2' to 6'. We're hoping that will grow together nicely, and with yearly pruning, they will become an attractive privacy hedge.
First of all, do you think this is doable, or a reasonable expectation? If so, do you have any pruning tips, such as when and how much?