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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.
Answers. Relevance. Rating Newest Oldest. Best Answer: After you use your weed and feed make sure to keep it watered, But don't put grass seed down for a least 2 weeks after your did the weed and feed. We have the greenest grass on our street, I also did the weed and feed and watered, then re-seeded after 2 weeks.Just make sure you keep your lawn watered during the process.e have the greenest grass on our street, I also did the weed and feed and watered, then re-seeded after 2 weeks. Just make sure you keep your lawn watered during the process.