We're sorry to read about your disappointment with Vigoro Weed & Feed(I) and appreciate your feedback.
The most common reason a lawn does not respond to fertilizer is soil pH. Soil pH must be between 5.5 and 7.5 for fertilizer to be absorbed by the grass. You may wish to perform a soil pH test. If you have thatch over a 1/2-inch thick, the product may not reach the soil and the roots.
This product should be applied to a wet lawn but then not be watered within 24 hours of application. Some weeds may twist and curl within the first week (even a few days), however, it may take 2 to 4 weeks for a complete kill. If the area is under heat/drought stress, or temperatures are above 90 degrees F or below 60 degrees F, the lawn may go dormant, slowing the greenup and weed control as well. There may also be an underlying issue, like a lawn disease or insect activity contributing to the appearance of the lawn. This product does not prevent new weeds from growing.
We want you to be confident in our products. For this reason, we offer a product guarantee to our consumers. At your earliest convenience, please reach out to us at 877-220-3089 if we can further assist.