If it snows heavily and for long periods at temperatures of around 0 degrees Celsius, you can observe how the branches become increasingly strained with weight and slowly bend towards the ground. They can no longer keep themselves upright with their own strength. Normally the branches and twigs are only able to right themselves again if the snow load has only been on them for a short time. However, already after only a few hours, their wood is usually so stretched that it can no longer straighten itself. For this reason, speed is of the essence as soon as an excessive snow load is visible on branches and twigs. Take a broom, for example, and shake or sweep snow carefully from the twigs in order to prevent branches breaking. If it snows heavily, you may have to repeat this as required.
Too much snow on plants which grow in a bed or have thick growth is not harmful. Incidentally, it can even provide additional protection from the cold.