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When stored under ideal conditions, grass seed lasts anywhere from 10 to 18 months from the testing date without any real decrease in the germination rate. You can still use the seeds after this timeframe, but the germination rates drop 10% to 20% each year. 

If you’re just embarking on an overseeding project, using seeds that have been in storage for a few years isn’t too big of a deal. However, if you’re planning on redoing your entire landscape, your best bet for a healthy, luscious lawn is to use new seeds.

There are several possible reasons why your Bermuda grass is not thick, with the biggest reasons being too little water, too much shade, compacted soil, drainage issues, and too few nutrients in the soil. Bermuda grass needs frequent and direct sunlight to stay thick, so thinning grass is likely the result of a lack of sun. 

The average cost to seed or reseed a lawn is about $1,100, with prices typically ranging from $450 to $1,700. The final cost depends on factors like your lawn size, the type of seed used, and local labor rates. On a per-square-foot basis, you can expect to pay between $0.10 and $0.20.

Here are some cost estimates based on lawn size:

• 500 square feet: $50–$100

• 2,000 square feet: $200–$400

• 4,000 square feet: $400–$800

• 5,000 square feet: $500–$1,000

• 1 acre: $3,000–$5,880

• 2 acres: $6,000–$11,760

• 5 acres: $15,000–$17,640

Popular seed types for residential lawns include bahia, fescue, and Bermuda. Compared to installing sod, seeding is generally a less expensive option, especially for larger areas.

Additional services can add to the total cost:

• Fertilization: $80–$400

• Soil testing: $700–$2,100

• Yard cleanup and leaf removal: $200–$560

• Weed treatment: $110–$325

• Mowing: $50–$210

Choosing the right grass seed and planting it at the right time are the most important factors in establishing fast-growing grass. You also need adequate water, sunshine, and nutrients. To speed up the growth process, you can implement some tips and tricks, including watering it deeply and frequently, and using an iron-rich fertilizer to boost its appearance.