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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.
Report Abuse. i dont know where you live but the fall is the best time to put down grass seed and you can put fertilizer down with it if you prefer however do not put WEED and feed down just feed. the weed will kill the grass seed.pickmefirstplz Â· 7 years ago.Thumbs up. 2.fter the soil is prepared, use a spreader or your hand to disperse the seeds throughout the yard. After the seeds are down, use a spreader to disperse starter fertilizer (Scotts makes a very good one). Make sure you keep the soil moist, and don't use a weed-n-feed until after the 4th mowing at least.