Grass Seed Germination Tips

Tips to maximize Grass Seed germination:

Grass seed germination is the process by which grass seeds sprout and grow into new grass plants. 

Seeding a lawn can be a big investment.  A big part of your lawn’s success is actually what happens after the seeding job is complete.

Why does grass seed germination matter in lawn care?

Grass seed germination determines when your lawn care treatment begins and ends each year. 

Soil temperature vs Air temperature

Grass seed germination is tied very closely to soil temperature. Soil temperature is NOT the same as air temperature.  If the air temps are 65 degrees, it does not mean the ground temperature is also 65 degrees.  Soil acts as an insulator.  The pores in soil will keep temperatures hot when they reach a warm point and cool when they reach freezing temperatures.  

Factors to consider for success:

  • Quality of grass seed

  • Quality of soil - sandy lawns 

What triggers grass seed to germinate?

Temperature! And no, not air temperature but ground temperature.   Whether you plant your grass in the fall, winter or Spring, grass seed will not germinate until soil temperatures are above 50 degrees.  

When is the best time of year to plant grass seed?

We have seen the most success with fall seeding.  Fall seedings allow grass 2 full seasons to grow and establish plants. They will be nice and hearty and ready to fight the pressures of heat and disease that come with summer time. 

How long does is take grass seed to germinate?

There are many contributing factors but you can generally expect grass seedlings to emerge anywhere between 7 and 21 days.  Avoid mowing your lawn for a minimum of 3 weeks to allow new grass to establish.  

Tips for maximizing grass seed germination:

  1. Choose the right grass seed: Different types of grass seeds have different germination rates and requirements. Consult with a local nursery or landscaping professional to determine the best type of grass seed for your climate and soil type. Here in the northeast we have cool season grasses.  If you live in the south, you might have more success with warm season grasses like Zoysia, Bermuda or Centipede grass. 

  2. Prepare the soil: Before planting grass seed, make sure the soil is prepared properly. Remove any weeds, debris, or rocks from the planting area. Loosen the soil with a shovel or tiller to allow the roots of the grass seedlings to grow easily.  Professional lawn care companies will use an Aeration vehicle that can loosen soil with a few passes over your lawn. 

  3. Plant at the right time: The best time to plant grass seed depends on your climate and the type of grass seed you are using. In general, cool-season grass seeds (such as Kentucky bluegrass and perennial ryegrass) are best planted in the fall, while warm-season grass seeds (such as bermudagrass and zoysiagrass) are best planted in the spring or early summer.

  4. Use the right amount of seed: Follow the recommended seeding rate for the type of grass seed you are using. Planting too much seed can lead to thin, weak grass, while planting too little may result in patchy, bare areas.

  5. Water regularly: Grass seed needs consistent moisture to germinate and grow. We recommend that your first watering be HEAVY to set the seed then daily for 3 weeks to keep the seed bed moist (but not waterlogged). Once the seedlings have sprouted and the grass has become established, you can reduce watering to once or twice a week.

  6. Protect the seedlings: Keep the seedlings protected from heavy foot traffic, leaves and mowing.  Avoid mowing for 3 weeks or until grass is about 5 inches high.  When you resume mowing, the height should be between 3.5-4 inches high. 

  7. Nourish seedlings: Use a grass seed starter fertilizer to give the seedlings the nutrients they need to grow strong and healthy.

By following these tips, you can help ensure that your grass seed germinates and grows into a healthy, lush lawn.