If you cut your hedge at the wrong time, you are only harming it, and you are getting the opposite of a thickly growing hedge.
Hedge trimming

Hedges need to be cut - no question. However, the hedge trimming in the different hedges is also different tackle.

Deciduous trees that form a hedge, such as the hornbeam or the beech and the wintergreen privet, get their main cut in winter, before the dormancy occurs. The second and less elaborate hedge trimming then takes place in the summer. This should not be done before the beginning of August. Those who cut their hedges before August sometimes endanger the breeding of the birds. Many birds choose hedges to build their nest.

Hedge trimming in conifers

Evergreen or coniferous trees must get their main cut before budding in spring and be trimmed vigorously in autumn. Another hedge trimming is often not necessary for these hedges, because they grow very slowly, such as the holly or the yew. When cutting care should be taken to cut out new annual shoots, so that as many remaining buds as possible are stimulated to a lively shoot.

Right time for the hedge trimming - weather decides -

Not only the season, but also the weather conditions are an important criterion for your hedge trimming. A sunny day is optimal, but there must be no scorching heat. This would damage the freshly cut shoots and dry them out. A hedgecut is best in the morning hours.
The main reason for the hedge trimming is that the branches branch well and thus form an optimal privacy. To prevent needles from becoming bald after hedge cutting, the hedge should not be cut back radically. Bring them in an appealing form.