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Along with helping your grass grow in thicker and healthier, overseeding better equips it against hungry insects, common lawn diseases, drought, heavy foot traffic, and other foes that can weaken or kill the grass over time. By investing the extra time and money into overseeding, you’re lowering potential costs of fertilizer, pesticides, or possibly reseeding the lawn in the future.

You can, like you can put too little down. Sowing too much grass seed can create competition between the seeds for resources (light, water, nutrients) and the seedlings could struggle to grow. When you sow too few, your lawn will come in thin. Your seed product has a recommended seeding rate, so use that as your guide.

You can thicken new grass by using fertilizer, watering it 1 to 1½ inches per week, mowing when it is at an optimal height, and preventing weeds. You should fertilize your grass while you plant the grass seed, or soon afterward. Use an herbicide to prevent weeds or spot spray with herbicide to kill existing weeds.

Morning and late afternoon are the best times for watering new grass seed. The seed gets a healthy balance of water and sunlight, and the excess water evaporates. If you water the grass long after the sun goes down, the air is too cold, and there's no sun to make excess water evaporate. This keeps the grass damp for too long, increasing the chances of over-watering.