in the fall?
The best time to prune boxwood shrubs in the fall is early September. If you wait until late in the autumn, it will be too cold for your plants and they may die off. You can use a rotary saw when cutting back boxwoods because this type of cut does not require heavy pruning shears or lopping tools [source: University of Michigan]. The only exception is if you have a tree that grows close to your house. In that case, you would need to remove limbs from trees with limbs within 20 feet of your home [source: American Boxwood Society ].