How to Choose the Right Fertilizer for Your Lawn

What's the Right Fertilizer for Your Lawn?

Lawn Fertilization Services in Boise Idaho - Safari Lawn Care

A healthy lawn starts with a proper lawn fertilization plan. But with a mind-boggling selection of products on the shelf, how do you select the correct one? Let's leave the guesswork behind and get your lawn flourishing. This guide will take you through all you need to know, from fertilizer numbers to ideal timing.

Understanding the Fertilizer Numbers (N-P-K)

The first thing you notice on any bag of fertilizer are three numbers, like 10-10-10 or 20-5-10. These fertilizer numbers represent the percentage of Nitrogen (N), Phosphorus (P), and Potassium (K), respectively. These are the macronutrients that your lawn needs the most.


  • Nitrogen (N): Encourages leafy green growth. Consider it the gasoline of your lawn's engine, fueling lush, observable growth.
  • Phosphorus (P): Promotes good root growth. Necessary for new lawn establishment and root health.
  • Potassium (K): Promotes overall plant health and resistance to disease. It supports your lawn's ability to handle stress, such as drought and cold.

Soil Testing

Before you reach for any fertilizer, take a soil test. This easy and affordable procedure tells you your soil's pH level and nutrient deficiencies. You can usually purchase soil test kits at your local garden store or through your local agricultural extension office.


  • Why soil testing is crucial:


It identifies specific nutrient deficiencies, avoiding over-fertilization.

It measures your soil's pH, which influences nutrient uptake.

It saves you money by preventing unnecessary fertilizer applications.

Choosing the Right Fertilizer Type

Once you have an idea of your soil requirements, you can pick the proper fertilizer type:


  • Granular Fertilizer:
  • Slow-release: Provides nutrients over an extended period.
  • Quick-release: Delivers nutrients rapidly, ideal for quick green-ups.
  • Choose depending on if you want a quick fix, or a sustained release of nutrients.


  • Liquid Fertilizer:
  • Fast-acting: Nutrients are absorbed quickly through the leaves.
  • Easy application: Can be applied with a sprayer.
  • Good for a quick boost.


  • Organic Fertilizer:
  • Made from natural materials like compost, manure, or bone meal.
  • Improves soil structure and long-term health.
  • Slower release of nutrients.



  • Synthetic Fertilizer:
  • Manufactured fertilizer.
  • Provides a precise ratio of nutrients.
  • Can be quick or slow release.
Lawn Fertilization in Boise, ID - Safari Lawn Care

Choosing the Right Fertilizer Type

Once you have an idea of your soil requirements, you can pick the proper fertilizer type:


  • Granular Fertilizer:
  • Slow-release: Provides nutrients over an extended period.
  • Quick-release: Delivers nutrients rapidly, ideal for quick green-ups.
  • Choose depending on if you want a quick fix, or a sustained release of nutrients.


  • Liquid Fertilizer:
  • Fast-acting: Nutrients are absorbed quickly through the leaves.
  • Easy application: Can be applied with a sprayer.
  • Good for a quick boost.
Lawn Fertilization in Boise, ID - Safari Lawn Care
  • Organic Fertilizer:
  • Made from natural materials like compost, manure, or bone meal.
  • Improves soil structure and long-term health.
  • Slower release of nutrients.


  • Synthetic Fertilizer:
  • Manufactured fertilizer.
  • Provides a precise ratio of nutrients.
  • Can be quick or slow release.

Consider the Timing

Timing is everything when it comes to successful fertilization. Fertilizing at the wrong time will waste product and actually damage your lawn.



  • Spring: This is an important season to fertilize since your lawn is emerging from dormancy. Fertilize once soil has heated up and your grass is growing.
  • Summer: Steer clear of heavy fertilization during the most intense heat of summer since it can stress your lawn. A slight feeding might be helpful, but water first.
  • Fall: Fall fertilization helps your lawn develop sturdy roots and winterize itself. Use a potassium-rich fertilizer about several weeks before the initial frost.
  • Avoid Frozen Ground: Never fertilize frozen soil, as the nutrients will not be taken up and can leach away.

Consider Your Lawn's Specific Needs

  • New Lawns: Need more phosphorus for root growth.
  • Established Lawns: Benefit from a balanced fertilizer or one higher in nitrogen.
  • Seasonal Needs:
  • Spring: Pay attention to nitrogen to keep them green.
  • Fall: Prioritize potassium for winter hardiness.
  • Local Climate: Your local climate will have a big impact on what kind of grass you have, and consequently what kind of fertilizer you should use. Talk with local nurseries, or check with agricultural extension offices for local advice.

Tips for Fertilizer Application

  • Read the instructions on the bag of fertilizer carefully.
  • Do not over-fertilize to avoid burning your lawn.
  • Water your lawn following the application of fertilizer to assist it in soaking up the nutrients.
  • Fertilize evenly. A spreader can be used to ensure that the fertilizer is applied evenly.
  • Do not apply fertilizer during peak sun hours.

Achieve a Healthy Lawn with the Right Fertilizer

Selecting the appropriate fertilizer for your lawn need not be complicated. By knowing what your lawn needs, understanding fertilizer labels, and using the product properly, you can have a healthy, thriving lawn that's the envy of the neighborhood. Keep in mind, a well-fed lawn is a contented lawn!


Learning lawn fertilization is an important step to a healthy yard. But if you'd rather just let the experts do the science and just love a lovely lawn, then get in touch with Safari Lawn Care. We specialize in customized lawn care services, including professional fertilization, weed control, and more. Leave the heavy lifting to Safari Lawn Care, and you can enjoy your outdoors.

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