Best Winter Fertilizer for St Augustine Grass

Winter is a challenging season for St Augustine grass, and finding the right fertilizer can be the key to maintaining a lush green lawn all year round. With the right winter fertilizer, you can promote root growth and nourish your lawn so that it’s healthy and vibrant when spring arrives.

Key Takeaways

  • Choosing the best winter fertilizer for St Augustine grass is crucial for a healthy and vibrant lawn year-round
  • Winter fertilization promotes root growth and maintains winter hardiness for St Augustine grass
  • Conducting a soil test and understanding St Augustine grass’s winter needs are essential for selecting the right winter fertilizer
  • Avoid potential damage to St Augustine grass by following best practices for winter fertilizer application and pest control
  • Proper lawn care during the winter months also includes proper watering and weed control

Understanding St Augustine Grass and Its Winter Needs

St Augustine grass is a warm-season grass that remains green throughout the year in regions with mild winters, such as Florida and the Gulf Coast. However, in colder climates, St Augustine grass goes dormant during the winter months, requiring special care and attention to maintain a healthy lawn.

During the winter, St Augustine grass experiences slower growth and reduced photosynthesis, making it more susceptible to stress and damage. To combat this, it’s essential to know the specific winter requirements of St Augustine grass and take proactive measures to ensure a healthy lawn throughout the cold weather.

Let’s explore the winter needs of St Augustine grass in more detail:

Cold Weather and Growth

St Augustine grass grows best in warm conditions, with optimal temperatures ranging from 80-95°F. In colder temperatures, the grass enters a dormant state, where it conserves nutrients and reduces metabolic activity to survive the winter months.

During dormancy, St Augustine grass requires minimal fertilization since the lower metabolic activity reduces nutrient demand significantly. Excessive feeding can lead to burning or death of the grass, making it important to choose the right fertilizer and apply it correctly.

Growing season

The growing season for St Augustine grass occurs during the spring and summer months, where proper fertilization, mowing, and watering are critical for establishing a lush and healthy lawn. By autumn, it’s essential to reduce watering and fertilization and prepare the grass for the upcoming winter dormancy.

Soil Requirements

St Augustine grass prefers well-draining soil with a pH range between 5.0–7.5. During the winter, soil moisture levels should be maintained to avoid stress. Sandy soils tend to dry out faster and require more frequent irrigation, while clay soils retain more moisture and must be monitored to prevent waterlogging.

Taking Care of Your Lawn

To sustain a healthy St Augustine lawn during winter, proper care must be taken. It’s essential to avoid overwatering, which can lead to root rot, and to avoid mowing excessively during dormant periods. Grass clippings should be left on the lawn to decompose, as it helps to return essential nutrients to the soil.

“By understanding the specific needs of St Augustine grass during the winter, you can keep your lawn healthy, vibrant, and ready to flourish come spring.”

In the next section, we will explore the importance of conducting a soil test and understanding fertilizer requirements during winter dormancy for St Augustine grass.

Conducting a Soil Test for Optimal Winter Fertilization

Before deciding on the best winter fertilizer for your St Augustine grass, it’s important to understand your soil’s nutrient composition and pH levels. Conducting a soil test will provide valuable insights into these factors, allowing you to choose the right fertilizer for optimal results.

The best time to take a soil sample is in the fall, approximately six to eight weeks before the first expected frost. This will ensure that you have ample time to receive accurate results and apply any necessary amendments before winter sets in.

To take a soil sample, use a soil probe or shovel to dig small holes throughout your lawn and gather soil samples at a depth of 3-4 inches. Combine the samples in a clean container and send them to a soil testing laboratory to be analyzed.

Understanding Soil Test Results

Soil test results will typically indicate the levels of phosphorus, potassium, and other key nutrients in your soil, along with your soil’s pH level. For St Augustine grass, a pH level between 5.5 and 6.5 is optimal for growth.

Additionally, soil tests may also indicate the level of organic matter in your soil. Organic matter plays a crucial role in soil health, as it promotes good soil structure and fertility, allowing for better nutrient uptake and water retention. Adding organic matter to your soil can also improve its ability to handle stress and resist disease.

soil samples

Interpreting Soil Test Results for St Augustine Grass

When interpreting soil test results, consider St Augustine grass’s specific needs. For example, this grass type typically requires higher amounts of nitrogen than other lawn types, especially during the growing season. Use nitrogen fertilizer to supplement any deficiencies indicated by the soil test results.

Keep in mind that too much of any nutrient can be harmful to your lawn. Apply fertilizer only as recommended and avoid applying during winter dormancy, as this can lead to potential damage to your St Augustine grass.

By conducting a soil test, you’ll be able to make informed decisions about your St Augustine grass’s winter fertilization needs, ensuring the best possible results for a healthy and vibrant lawn come spring.

Choosing the Best Winter Fertilizer for St Augustine Grass

Winter is a critical season for St Augustine grass, and selecting the right winter fertilizer can make all the difference in maintaining a healthy lawn. The right fertilizer will promote root growth and winter hardiness, ensuring your lawn stays lush and green even during the colder months.

There are various types of winter fertilizers to choose from, and each has its benefits. Nitrogen-based fertilizers are popular for their quick results and the immediate greening effect they have on lawns. Organic fertilizers, on the other hand, are more sustainable and have longer-lasting effects on soil health.

For the best results, consider a fertilizer that blends both nitrogen and organic matter. This combination will provide the ideal balance to achieve a healthy lawn with a vibrant green color.

Best Lawn Fertilizers for St Augustine Grass

Fertilizers Benefits
Nitrogen Fertilizers Rapid lawn growth, immediate green color
Organic Fertilizers Long-lasting effects on soil health, sustainable
Blended Fertilizers Balance of quick results and long-lasting effects

When choosing the best fertilizer for your St Augustine grass, look for products with a high percentage of nitrogen. Aim for approximately one pound of nitrogen per 1000 square feet of lawn. This will provide enough nitrogen to promote growth without damaging the grass.

Additionally, consider the timing of fertilizer applications. Late fall is the best time to apply winter fertilizer, as it allows the grass to absorb the nutrients before entering dormancy. Avoid fertilizing during winter dormancy, as it may result in damage to the grass.

By choosing the right winter fertilizer for your St Augustine grass and following proper application guidelines, you can achieve a healthy and vibrant lawn, even during the coldest months of the year.

Best Practices for Applying Winter Fertilizer

Proper application of winter fertilizer is crucial for the health and vitality of your St Augustine grass. Applying fertilizer at the right time and in the proper amounts can make all the difference in avoiding potential damage to your lawn. Here are some guidelines to follow for optimal results during winter dormancy:


The best time to apply winter fertilizer for St Augustine grass is late fall through early winter when the grass has entered dormancy. It’s important to avoid applying fertilizer during the colder months as it may not be absorbed efficiently and can lead to potential nitrogen loss.


When it comes to fertilizer applications, less is often more. Applying too much nitrogen fertilizer can cause excessive top growth, leading to weaker root systems and lower winter hardiness. A general guideline is to apply 1-2 pounds of nitrogen per 1,000 square feet of lawn during winter dormancy. Be sure to carefully follow the manufacturer’s instructions and avoid over-fertilization.


While it may be tempting to apply fertilizer more frequently, it’s essential to avoid overdoing it. Applying fertilizer every 6-8 weeks during winter dormancy is recommended. However, it’s important to conduct a soil test to determine the specific needs of your lawn as too much fertilizer can lead to environmental harm.

Pro Tip:

Consider using organic fertilizers as they release nutrients slowly and are less likely to harm the environment. Additionally, they improve the soil structure and increase the water-holding capacity of sandy soils or heavy clay soils in urban areas.

In summary, following proper application guidelines for winter fertilizer is essential for St Augustine grass to maintain optimal health during the colder months. By understanding the best time, amounts, and frequency of fertilizer applications, you can ensure a lush, green lawn in the spring.

Pest Control for St Augustine Grass in Winter

Winter can be a challenging time for maintaining a healthy lawn, as certain pests and diseases start to emerge. Two common culprits are mole crickets and chinch bugs. Mole crickets feed on the roots of St Augustine grass, causing significant damage that can result in brown patches and even bare spots on the lawn. Chinch bugs, on the other hand, suck the sap from the grass blades, leading to yellowing and stunted growth.

One effective way to control these pests is by using a pre-emergent herbicide. This herbicide creates a barrier in the soil that prevents the pests from hatching and emerging onto the lawn surface. However, it’s important to apply the herbicide at the right time, typically during the fall or early winter before the pests have a chance to hatch. Be sure to follow the herbicide’s instructions carefully and apply it evenly across the lawn.

In addition, maintaining healthy turfgrass growth can also help prevent pest infestations. Proper fertilization and watering practices are key to promoting a thick and well-rooted lawn that is more resistant to pests and disease. Regular mowing and removal of excess thatch can also prevent the buildup of pests and other harmful organisms.

Benefits of Pre-Emergent Herbicides

Benefits Explanation
Controls weed growth Pre-emergent herbicides can prevent the germination and growth of various weeds, keeping the lawn free of unsightly and invasive plants that can compete with St Augustine grass for nutrients and moisture.
Prevents pest infestations By targeting the eggs and larvae of pests like mole crickets and chinch bugs, pre-emergent herbicides can prevent these pests from hatching and damaging the lawn.
Easy to apply With the right equipment and knowledge, pre-emergent herbicides can be applied easily and efficiently across large areas of lawn.

With the right pest control measures and proper care, your St Augustine lawn can remain healthy and vibrant even during the winter months.

Winter Lawn Care Tips for St Augustine Grass

Besides using winter fertilizer, there are a few other things you can do to ensure your St Augustine grass stays healthy during the colder months. Follow these winter lawn care tips for optimal results:

Proper Watering

Watering your St Augustine grass correctly during winter dormancy is crucial to avoid dehydration and other issues. Watering too little can lead to wilted grass, while overwatering can promote fungal growth. For sandy soils, water once every two weeks, while clay soils only need watering once a month. Ensure your lawn receives about an inch of water each time, and adjust it according to rainfall levels.

Weed Control

Weeds can quickly take over a lawn if left unattended, and during the winter months, St Augustine grass is particularly vulnerable. Use pre-emergent herbicides specifically formulated for St Augustine grass to prevent weed growth, and hand pick any visible weeds before they can spread.

Brown Patch and Large Patch Prevention

Brown patch and large patch are common issues that can arise during cold weather and if your lawn has a history of fungus problems. To prevent patch diseases, ensure your lawn doesn’t stay wet for extended periods, don’t over-fertilize, and avoid watering in the evenings.

winter lawn care

By following these winter lawn care tips, you can ensure your St Augustine grass remains healthy, green, and disease-free throughout the winter months.

Transitioning St Augustine Grass from Winter to Spring

With late winter and early spring, it’s natural to start thinking about a lush, green lawn. St Augustine grass requires some careful attention during the transition from winter dormancy to the growing season. Fortunately, with some best practices, you can achieve that dark green color you want for your lawn.

Gradual Increase of Watering

During the winter season, watering frequency is reduced, but as the temperature rises, gradually increase the watering frequency. The goal is to avoid shocking the dormant grass with too much moisture. Watering deeply once a week would be ideal. Always water in the early morning to reduce evaporation and fungal growth.

Application of Fertilizer

The spring season is the growing season for St Augustine grass. Therefore, it’s essential to apply a slow-release fertilizer with a higher percentage of nitrogen to encourage new growth and promote a healthy green lawn. Your lawn will require approximately one pound of nitrogen per 1,000 square feet.

Be cautious when applying fertilizer as over-fertilization can lead to excessive growth, making the lawn susceptible to pests and diseases.

Prevent Weed Growth

Weed competition is one of the major reasons for poor-quality turfgrass. Post-emergent herbicides can be applied to tackle filaree, dandelions, crabgrass, and other weeds.

Mowing Tips

Set your mower blade height to cut your St Augustine lawn between three and four inches high. Mowing at the correct height can conserve moisture and shade the soil from the sun to retain nutrients.

After the transition, your St Augustine grass should be healthier and ready for summertime activities. Proper spring care leads to a green lawn, beautiful during the growing season.


In conclusion, maintaining a healthy St Augustine grass lawn throughout the winter months requires more than just a good winter fertilizer. Proper winter lawn care practices, including conducting a soil test, pest control, and transitioning to spring, are essential for a lush and green lawn in the spring.

By following the guidelines outlined in this article, you can achieve the best results for your St Augustine grass lawn. Don’t hesitate to consult with a professional landscaper or gardening expert for additional guidance and tips on winter lawn care.

Remember, a beautiful and healthy lawn is within your reach with proper care and attention, and your efforts will pay off with a vibrant St Augustine lawn that your neighbors will envy.


What is the best winter fertilizer for St Augustine grass?

The best winter fertilizer for St Augustine grass is one with a high nitrogen content and a lower phosphorus and potassium ratio. Look for fertilizers specifically formulated for St Augustine grass, with an NPK ratio of around 3-1-2 or 4-1-2. These ratios will promote healthy root growth and help maintain a lush green lawn.

When is the best time to apply winter fertilizer to St Augustine grass?

It is best to apply winter fertilizer to St Augustine grass in late fall or early winter, when the grass begins to enter its winter dormancy period. Applying the fertilizer at this time allows the nutrients to be absorbed by the roots and stored for the winter months, helping the grass to stay healthy and recover quickly in the spring.

How often should I fertilize my St Augustine lawn during the winter months?

For most St Augustine lawns, one application of winter fertilizer is sufficient. Applying too much fertilizer can cause excessive growth and make the grass more susceptible to cold damage. However, if your lawn has poor soil quality or is showing signs of nutrient deficiency, you may consider a second application of winter fertilizer. It is always a good idea to conduct a soil test before applying any fertilizer to determine the specific nutrient needs of your lawn.

Can I use organic fertilizers for my St Augustine grass during winter?

Yes, organic fertilizers can be used for St Augustine grass during winter. Organic fertilizers provide slow-release nutrients that are released gradually over time, feeding the grass throughout the winter months. Look for organic fertilizers that are specifically formulated for St Augustine grass and follow the manufacturer’s instructions for application rates.

How do I prevent pests like mole crickets and chinch bugs in my St Augustine lawn during winter?

To prevent pests like mole crickets and chinch bugs in your St Augustine lawn during winter, it is recommended to apply a pre-emergent herbicide in the late winter or early spring. This will create a barrier that prevents these pests from establishing in your lawn. Additionally, regular monitoring of your lawn for signs of pest activity and prompt treatment if any pests are detected can help keep your lawn healthy and pest-free.

What are common issues that can affect St Augustine grass during winter, and how do I combat them?

Common issues that can affect St Augustine grass during winter include brown patch and large patch diseases. To combat these diseases, ensure proper drainage in your lawn, avoid overwatering, and do not apply excessive nitrogen fertilizer during the winter months. Regularly monitor your lawn for signs of disease and promptly treat any affected areas with appropriate fungicides.

How do I transition my St Augustine grass from winter to spring?

To transition your St Augustine grass from winter to spring, gradually increase the frequency and amount of watering as the temperatures rise. This will help wake up the grass from its winter dormancy and encourage new growth. It is also beneficial to perform a soil test in early spring and apply a balanced fertilizer to provide the necessary nutrients for a healthy and vibrant lawn.

Leave a Reply

Your email address will not be published. Required fields are marked *

Recent Posts