Herbicides are chemicals used to control or suppress weeds. Preemergence herbicides are applied before weeds germinate, and prevent the germinating seeds from establishing. Once emerged, many weeds may be control using Postemergence herbicides. Herbicides may be selective or non-selective; have contact action or systemic (translocated). The following resources have been developed to aid in selecting the most appropriate herbicide for the task.
Herbicide information fact sheets are about PRE and POST herbicides labeled for use in nursery or landscape settings.
Preemergence herbicide efficacy summary chart, Ranking the efficacy of preemergence herbicides on most weeds of nursery and landscape plantings.
Postemergence herbicide efficacy summary chart providing rankings of postemergence herbicide efficacy on common weeds of nursery and landscape plantings.
A summary table of ornamental plants listed on preemergence herbicide labels.
Postemergence Herbicides for Woody Ornamentals, revised 2013 Listings of postemergence herbicides labeled for use over or around woody ornamental plantings.
A summary table of herbaceous ornamental plants listed on preemergence and postemergence herbicide labels. Edited from tables created by Dr. Andrew Senecac of Cornell Cooperative Extension of Suffolk County, NY