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Yes, some grass will germinate in two weeks or less but it will take several weeks more before it is established enough to walk (or nap) on. To grow grass quickly, follow the tried-and-true-steps carefully, starting with choosing a cool- or warm-season grass seed that flourishes in your home’s climate.

No, it's not a good idea to put grass seed directly on top of dead grass. For successful germination and growth, grass seed needs good soil contact. To prepare the area, start by removing the dead grass using a shovel or a sod cutter. Then, loosen the soil, add soil amendments if necessary, and spread the grass seed evenly. This allows the seed to come into direct contact with the soil, promoting better germination and establishing a healthier lawn.

If you use a starter fertilizer designed for this purpose, you can overseed and fertilize at the same time. If you opt to use a fertilizer for established grass or one with a weed control component, it's best to wait at least four to eight weeks after seed application to allow the new grass to take hold and establish itself. 

Soaking grass seeds in water before seeding is called pre-germinating. It’s not necessary but can be very helpful in some cases. Some grasses like are very slow to germinate, and basic seeding on the ground is unlikely to be effective—that’s especially true of cool season grasses like Kentucky bluegrass, rye grasses, and Bermuda grass. Soaking these seeds in a bag or bin of water for one to four days beforehand can give the grass the start it needs to survive.