All deciduous shrubs will be trimmed to maintain growth within space limitations, to maintain or enhance the natural growth habit, or to eliminate diseased or damaged growth.  Some species shall be trimmed appropriately to influence flowering. 

Evergreen shrubs should be trimmed only at times when their growth indicates.  Trimming should be scheduled during non-blooming periods.Shrub Trimming services for the Twin Cities in Minnesota from Ground Force Lawncare, Chisago City, MN

We use the pruning guidelines set by the University of Minnesota.