How to Fertilize Your Lawn

The grass is always greener where you fertilize it. If you want the kind of thick, dark green lawn that makes all the neighbors jealous, follow LawnStarter’s step-by-step advice on how to fertilize your lawn, whether you’re using liquid or granular fertilizer. 

How to Prepare Your Lawn for Fertilization 

Don’t jump straight to fertilizing your lawn – not if you want it to work. First, you have to find out what’s going on with the soil beneath your lawn and make any necessary changes. 

Step 1: Test your soil

Testing your soil lets you know your soil pH and what nutrients your soil is lacking. Since fertilization is all about feeding your lawn the nutrients it needs, a soil test will help you choose the right fertilizer for your grass. 

You can test your soil at home using pH strips from the store, but that kind of test will only indicate soil pH and won’t tell you anything about important plant nutrients.

Get a more in-depth test by sending a soil sample to a laboratory. You should be able to get a soil test from your state university’s local county extension office, which you can find on the National Institute of Food and Agriculture’s university directory. 

Step 2: Adjust soil pH as needed

Your soil test might reveal that your soil pH is too acidic (meaning too low) or too alkaline (meaning too high). With acidic or alkaline soil, your grass will have a hard time absorbing the nutrients from the fertilizer, no matter how much of it you apply. 

The ideal pH range for most grasses is 6.5 – 7. If your soil pH is lower than that range, add agricultural lime to raise it before fertilizing. If your soil pH is higher than that range, add elemental sulfur to lower it before fertilizing. Your soil test results should include advice on how much lime or sulfur to apply for your specific needs.

Step 3: Water the lawn a few days before fertilization

About three to four days before fertilizing, water your lawn as you normally would. That way, by the time you add your chosen fertilizer, the soil will be moist – but not too wet – and ready to absorb nutrients. 

How to Apply Granular Lawn Fertilizer 

Some lawn fertilizers come in the form of granules, which are tiny, dry particles that usually come in a bag. These are called granular fertilizers. 

Step 1: Use a lawn spreader 

For granular fertilizers, you’ll need a fertilizer spreader, so the first step is to choose the right spreader for your yard:

• Handheld spreaders hold a small amount of fertilizer and are best for smaller yards.
• Broadcast spreaders, aka rotary spreaders, throw the fertilizer in a wide radius for faster application. 
• Drop spreaders fertilize one small spot at a time, so they’re good for accuracy. 

Once you’ve chosen your fertilizer spreader, set it to the right application rate setting. The label on your fertilizer bag will tell you which setting to use for that specific product.

Put the spreader on the driveway or another hard surface – not your grass – to fill it with fertilizer. That way, any spilled product won’t get into the soil, potentially burning your grass. Make sure the hopper is closed, then pour as much fertilizer into the spreader as you’ll need to cover your entire yard. 

Step 2: Fertilize the perimeter first and work your way inward

First, walk the spreader around the outside edge (perimeter) of your lawn. Walk at a slow, steady pace to ensure even coverage. 

When you’re done with the perimeter, walk the spreader back and forth across the lawn in straight lines, similar to the pattern you follow when you mow. Overlap a few inches on each pass so you don’t miss any spots. Continue until you’ve covered the whole lawn. 

Step 3: Water the lawn immediately 

Right after spreading fertilizer, thoroughly water your lawn by hand or with sprinklers. The water will push the granules down into the soil and help the soil absorb them.

Step 4: Clean up after yourself

After fertilizing the lawn, sweep up any excess granules on the driveway and other hard surfaces and throw them in the trash. If you leave excess fertilizer out, rainwater will eventually carry it into natural bodies of water, polluting them with chemicals. 

Remove the leftover fertilizer from the spreader and put it back in the bag, then store it in a cool, dry place far from the curious reach of pets and children. 

Once the fertilizer spreader is empty, open the hopper and spray down the whole machine with a hose. Store your fertilizer spreader inside so it doesn’t rust. 

How to Apply Liquid Lawn Fertilizer 

Instead of granules, some lawn fertilizers come as a liquid in a bottle or as a water-soluble material that you mix with water. You spray these fertilizers across your lawn. 

Step 1: Attach or fill your sprayer 

Many liquid lawn fertilizers come in a “ready-to-spray” hose-end sprayer that attaches to your garden hose. You don’t have to dilute these with water yourself because the hose will automatically do it for you. Just screw the bottle securely onto the hose and spray.   

If your fertilizer doesn’t come in a “ready-to-spray” bottle, you’ll have to mix it with water before using it. The product label will tell you the proper ratio of fertilizer to water. Once you’ve diluted the fertilizer, pour it into a handheld or backpack sprayer. 

Step 2: Apply fertilizer evenly over the whole lawn

Walk slowly across your lawn in straight lines, spraying from side to side across your body as you go. Pay attention to how far your sprayer reaches so you can pick up on the next pass where it leaves off. 

Try not to miss any spots, and try not to overspray any spots. Applying liquid fertilizer evenly can be tricky if you don’t know what you’re doing. Many homeowners have found that liquid fertilizer results in a patchy lawn. 

Step 3: Wait a few hours to water 

Don’t water your lawn immediately after spraying liquid fertilizer. The water will wash the fertilizer off your grass before it has a chance to soak into the soil. 

Give the fertilizer time to dry, which should take about two to four hours. Once the lawn seems mostly dry, water thoroughly to help your grass absorb the nutrients in the fertilizer. 

Step 4: Clean out your sprayer 

If you used a handheld or backpack sprayer, empty any leftover fertilizer back into the original container and rinse out the sprayer with a hose. Store the container of fertilizer in a climate-controlled place indoors, outside the reach of pets or small children. 

More Advice on Fertilizing Your Lawn

Now you know how to fertilize your lawn, but there’s more to the job than that. For the best lawn possible, you have to apply the right fertilizer at the right time of year. 

When to fertilize your lawn: The best time to fertilize your lawn is during its active growing season, which varies by type of grass. Fertilize warm-season grasses in early spring, early summer, or early fall. Fertilize cool-season grasses in early spring, early fall, and late fall. Learn more in our guide to When to Fertilize Your Lawn.

Choosing the right fertilizer for your lawn: Different fertilizers are suited for different lawn needs. First, you have to find a fertilizer with the right amount of nitrogen, phosphorus, and potassium for your soil. You also have to choose between immediate-release or slow-release fertilizers and synthetic or organic fertilizers. Learn more in our guide on How to Choose the Right Fertilizer for Your Lawn. 

FAQ About Lawn Fertilization

Professional Lawn Care Help 

When you fertilize your grass on a regular schedule, it will grow faster than ever, which is great … unless you want to spend your weekends on something other than mowing the lawn. 

Want a thick, healthy lawn with lots of new growth without the hassle of keeping it cut? Weekly lawn mowing service from LawnStarter’s local lawn care pros is only a click away. 

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