Answer:
Most weed control and fertilizer products need to reach the soil to accomplish the desired objective. For full effectiveness of treatments and to maximize your investment it is suggested to follow the irrigation recommendations specified on your invoice. Both weed control and fertilizer products can bring unsightly results if not watered properly.
Pre-emergents, once applied, will begin to break down and loose effectiveness due to sunlight and heat if not irrigated timely. If not watered at all, there is a good chance that weeds will germinate.
Fertilizer, on the other hand, if not irrigated timely can cause unsightly discoloration to the turf. Generally fertilizer burn will not kill the turf, however, it does cause stress. For full effectiveness of treatments and to maximize your investment it is suggested to follow the irrigation recommendations specified on your invoice.