We are sorry that you experienced problems while using Scotts EZ Seed Sun & Shade. Unfortunately, I cannot be certain why your grass has died after growing well at first. Once they start growing, grass seedlings may succumb to environmental factors such as disease, insects, or extremes of temperature and moisture. This is not necessarily evidence of inferior grass seed, as even superior grass types are subject to natural stresses. Maintaining constant soil moisture is the most critical factor in the success of a new seeding, both before and after germination. Even though the seed germinated, the soil may have dried out for a short time after it was up and growing. Two enemies of newly seeded lawns are herbicides and lawn diseases. While you have very little control over the outbreak of a lawn disease, please make sure that no weed control or weed prevention chemical has been used in the area, as those products will also prevent or inhibit germination. When used on newly germinated lawns, herbicides will kill off the new grass. If you see the grass ailing, I recommend that you contact a local nursery for help with diagnosis. 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 contact us to see what can be done. You may visit our contact page by clicking on the following link http://tinyurl.com/7ag7a3n