How short can evergreen shrubs be trimmed?

Evergreen shrubs can typically be trimmed to about one-third of their height, depending on the species and their growth habits. However, it's essential to avoid cutting them back too severely, as this can stress the plant and affect its health. For most evergreen shrubs, maintaining a natural shape while removing dead or damaged branches is advisable. Always consider the specific requirements of the type of shrub you are trimming for the best results.