If you will be reseeding the area, turf species listed on the product label can be seeded one week after the application of the Q4 Plus Turf Herbicide.
According to the product label, you should not mow 2 days before or 2 days after applying Q4 Plus Turf Herbicide.
The health of the plant will depend on how long it takes Q4 Plus Turf Herbicide to kill weeds/crabgrass. The weeds normally will start to die within one week of application but could take up to three weeks. A second application may be needed.
Most insecticides containing the active ingredient Quinclorac, such as Q4 Plus Herbicide,
Per the product label for Q4 Plus Turf Herbicide it states the following:
Certain spray tank additives such as surfactants may reduce the selectivity on the turfgrass. Use adjuvants only when your experience indicates that the tank mixture will not result in objectionable turf injury.
Q4 Plus Turf Herbicide does not require the use of a surfactant.
Q4 Plus Turf Herbicide can be applied with a hose end sprayer but only if can be calibrated to the rate needed per 1000 sqft.