Herbicide residue may still be present on the clippings and could harm the ornamental plants. If in doubt, wait 24 hours. Identifying the weeds in your lawn is the first step in any control program. If you cannot identify a weed, take a sample to your local nursery or country cooperative extension. For example, crabgrass and dallisgrass grow in soggy places, indicating possible poor drainage.
Curly dock tends to invade lawns overstressed by heat and drought.
Correcting the problem may be enough to discourage the weeds. Sprayers Gardeners have a wide choice of sprayers for applying liquid herbicides.