This agriculture extension service publication from Pennsylvania State University discusses the control of common grass and broadleaf weeds through the use of mulches and herbicides. The section on mulches discusses the different types of mulching materials, their advantages and disadvantages, herbicide-mulch combinations, and lists source of supply and usefulness of the various mulching materials. The section on chemical weed control discusses sprayer calibration, weed control programs, and herbicide safety. Also, this section contains tables that show weed succeptability to seven common herbicides, the application rates of these herbicides, and landscape plants that are tolerant to these herbicides. (MR)