The rough preliminary cut in early summer, followed by the detailed work in the middle of summer.
For shrubs and trees, large and small alike: Good preparation is key when cutting the plants in your garden. For example, to make getting rid of the waste cuttings afterwards easier, it's a good idea to spread a so-called landscape tarp under the plant that you are working on. You should also consider the shape you want to achieve in the end – prior planning makes for succesful trimming
Are you a novice among boxwood artists? You might find an additional shape guide to be especially helpful: Using wire or lengths of twine, you can create an aid to guide your cutting. Cardboard stencils can also be very helpful when clipping your trees or hedges into shape.
Overall, caution is advised when trimming: It's better to gradually feel your way to the desired result and patiently shape your garden hedges. If you do make a mistake when pruning, keep the following in mind: New shoots will grow from below the cuting and can fill in bare patches.