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The best time to put grass seeds down is in the fall. This gives the seeds time to mature before the stresses of summer like heat, traffic, mowing and diseases.he best time to put grass seeds down is in the fall. This gives the seeds time to mature before the stresses of summer like heat, traffic, mowing and diseases.
You don't want to bury the grass, and you don't want to take a chance on uprooting the seedlings by raking the amendment around. So reserve this treatment for a lawn that was seeded at least 2-3 months prior, when it just sits there and you haven't been successful getting this new grass to grow past an inch or two. You can apply gypsum to improve the texture and drainage capability of the soil.