Hi Jorge, we're sorry to read about your disappointment with Scotts Turf Builder Southern Lawn Food and appreciate your feedback. The most common reason a lawn does not respond to fertilizer is soil pH. Soil pH must be in-between 5.5-7.5 for fertilizer to be absorbed by the grass. Perform a soil pH test. Grass may be under stress from disease or insect activity. A continued or general yellow look may indicate a lack of iron. If the lawn isn't receiving at least an inch of water per week, then the lawn will not green up as fast. Re-apply Lawn food in 6 weeks. Thatch lawn to remove excessive buildup. We want you to be confident in our products. For this reason, we offer a product guarantee. If for any reason you, the consumer, are not satisfied with the results after using this product, you are entitled to get your money back. Limitations apply. At your earliest convenience, please reach out to us at 888-270-3714 if we can further assist.