Who touches up shrubs with a string trimmer? If I see a stalk shooting up on a shrub I with hit with my string trimmer when in the area weed wacking. This helps it look better a littler longer between trimmings with a hedge trimmer. I seen a guy trimming a complete shrub at a commerical burger king with a string trimmer. Acutally it did not look to bad. I would not trim a complete shrub this way but he was.