Weed controls start early in the year and begin again in the late summer months. These applications aid in controlling weeds before they get started. Once watered in, the pre-emergent weed control sets up a barrier in the soil to prevent seeds from germinating. Ideally you will never see the potential weed problems. Your technician will also spray for any weeds already established on all regular lawn care visits. A mixture of pre-emergent and fertilizer are used as an application to lengthen the control of weeds in the grass growing seasons. As always, there is no extra charge if we need to re-spray for weeds within 30 days after your last lawn application.