Quick question. I don't get into landscaping, but more of the maintenance aspect. Shrubs, mulch, etc. Anyways, i have a high end customer who wants her ornamental grasses cut back. Their growing too far out. Can i just get my hedge trimmers and just trim around the outside perimeter of grasses to keep them from growing over other plants and walkways? Just wanted some info before i go ahead and do this. I don't want the grasses to burn if their cut at the wrong time, or way.