How Much 13-13-13 Fertilizer To Use On a Lawn (My Lawn Secret!)

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Hey there, fellow lawn enthusiasts! Do you struggle with figuring out how much 13-13-13 fertilizer to use on your lawn? Fret not, for I’m here to help you achieve that lush, green lawn of your dreams. In this blog post, we’ll dive into the world of 13-13-13 fertilizer, discuss how much you should use, and provide you with tips to optimize your lawn care routine. So, let’s get started!

To use 13-13-13 fertilizer on your lawn, apply 10 lbs per 1,000 square feet. For optimal results, evenly spread the fertilizer and water the lawn after application. The balanced nutrient ratio (13% Nitrogen, 13% Phosphorus, 13% Potassium) promotes healthy growth and root development.

What factors come into the picture while deciding the perfect quantity for the lawn? Why is a 13-13-13 fertilizer highly recommended? Let’s get all your queries about it’s usage addressed in this article.

Understanding 13-13-13 Fertilizer

Before we dive into the nitty-gritty details of using 13-13-13 fertilizer on your lawn, let’s first understand what it is.

The numbers 13-13-13 represent the ratio of three essential nutrients: Nitrogen (N), Phosphorus (P), and Potassium (K). A 13-13-13 fertilizer contains 13% of each nutrient, offering a balanced formula that provides an all-around boost to your lawn.

Nitrogen: Promotes leafy growth and gives your lawn its lush green color. I’ve written an in-depth article about nitrogen here.

Phosphorus: Encourages strong root development and helps plants utilize other nutrients efficiently. If you’re wondering why plants need phosphorus, check out my article here.

Potassium: Improves overall plant health, drought resistance, and disease tolerance. I’ve also written an article about why plants need potassium.

Now that we’ve covered the basics let’s discuss how much 13-13-13 fertilizer you should use on your lawn.

Calculating the Right Amount for Your Lawn

When it comes to fertilizing your lawn, the rule of thumb is to apply 10 lbs of 13-13-13 fertilizer per 1,000 square feet. To determine the right amount for your specific lawn, follow these steps:

Measure Your Lawn

First, measure the length and width of your lawn in feet. Multiply these two numbers to find your lawn’s total square footage.

Calculate Fertilizer Amount

Next, divide your lawn’s total square footage by 1,000. Then, multiply this number by 7 to find the minimum amount of fertilizer needed and by 10 to find the maximum amount.

Choose Your Rate

Based on your lawn’s needs and condition, decide on a rate between 7 and 10 lbs per 1,000 square feet. Opt for a lower rate if your lawn is already in good shape. If it needs more TLC, go for a higher rate.

Applying the Fertilizer: Timing and Technique

Timing is everything when it comes to fertilizing your lawn. Here’s what you need to know about when and how to apply 13-13-13 fertilizer:

Time of Year

The best time to apply 13-13-13 fertilizer is during the early spring or fall. These seasons provide optimal growing conditions, allowing your lawn to absorb nutrients efficiently. If you want to know more, I’ve written an article about when to use what type of fertilizer.

Soil Temperature

Ideally, apply the fertilizer when soil temperatures are between 55-65°F. This temperature range ensures that your lawn’s roots can absorb the nutrients effectively.

Application Technique

Use a broadcast or drop spreader to distribute the fertilizer across your lawn evenly. Overlap your spreading pattern slightly to ensure uniform coverage. You can also use a seed spreader to fertilize your lawn.


After applying the fertilizer, water your lawn thoroughly to help the nutrients penetrate the soil and reach the roots. Be sure to water consistently in the weeks following application to support nutrient absorption and overall lawn health.

Maintaining Your Lawn After Fertilization

To keep your lawn in tip-top shape after fertilizing, follow these essential maintenance tips:

  • Mowing: Mow your lawn regularly, but avoid cutting more than one-third of the grass blade length at a time. This practice helps maintain a healthy grass height and prevents stress on the lawn.
  • Aeration: Aerating your lawn annually can improve soil structure, promote root growth, and enhance nutrient absorption. Aeration involves removing small soil plugs from the lawn, allowing air, water, and nutrients to reach the grass roots more easily.
  • Dethatching: Thatch is a layer of dead grass, roots, and other organic material that accumulates at the soil surface. Excessive thatch can hinder water and nutrient penetration. Dethatch your lawn as needed to maintain a healthy grass environment.
  • Weed Control: Apply a pre-emergent herbicide during early spring to prevent weed growth. For any existing weeds, use a post-emergent herbicide or hand-pull them to keep your lawn looking its best.


Achieving a lush, green lawn is possible with the proper use of 13-13-13 fertilizer. By following the guidelines outlined in this post, you’ll be well on your way to maximizing your lawn’s beauty. Remember to measure your lawn, calculate the right amount of fertilizer, and apply it during the optimal time and soil temperature. Don’t forget to keep up with regular lawn maintenance, including mowing, aeration, dethatching, and weed control. With a little patience and effort, you’ll soon be the envy of your neighborhood with a stunning, vibrant lawn.

So, are you ready to give your lawn the boost it needs? Grab your measuring tape, dust off your spreader, and let’s get fertilizing! Your lawn will thank you for it.

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