Best Tomato Fertilizer: NPK Ratios & Top Organic Fertilizers

indeterminate tomato varieties

I love growing tomatoes, but sometimes the leaves turn purple or yellow, the plant starts wilting, or flowers grow but they just fall off the plant.

Most of the issues you might have with your tomato plants can stem from a lack of certain nutrients. That’s where tomato fertilizers come into play.

The Best Tomato Fertilizers for Your Garden (Natural & Organic)

Here are the top tomato fertilizers I’ve found for growing tomatoes. #2 is my favorite so far because I can use it for almost everything in the garden.

  1. Dr. Earth Organic Tomato & Herb Fertilizer
  2. Dr. Earth Organic Tomato & Herb Fertilizer
    • OMRI, OIM, CCOF, NOP Listed Organic
    • Non-GMO Verified
    • Made in the USA
    NPK Ratio: 4-6-3
    Fertilizer Type: Granulated
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  3. AgroThrive All Purpose Organic Liquid Fertilizer 3-3-2 NPK
  4. AgroThrive All Purpose Organic Liquid Fertilizer 3-3-2 NPK
    • OMRI, CDFA, and WSDA Listed Organic
    • Comes from organic fish and grains
    • A mixture of slow-release and quick-release fertilizers

    Agro Thrive is great for most vegetables and herbs and is a super-concentrated formula that lasts for a long time. You mix 2-4 oz into a gallon of water and add it to the soil. You can even use this fertilizer on your lawn.

    NPK Ratio: 3-3-2
    Fertilizer Type: Liquid
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  5. Espoma Garden-Tone Plant Food, Natural & Organic Fertilizer
  6. Espoma Garden-Tone Plant Food, Natural & Organic Fertilizer
    NPK Ratio: 3-4-4
    Fertilizer Type: Granular
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  7. Jobe’s Organics Fertilizer
  8. Jobe’s Organics Fertilizer
    • OMRI Listed
    • Contains Jobe Biozome; Extremely aggressive proprietary microorganism archaea that aggressively breaks down material for faster results
    • No synthetic chemicals
    NPK Ratio: 2-5-3
    Fertilizer Type: Granular
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  9. Farmer's Almanac Fertilizer
  10. Farmer's Almanac Fertilizer
    • OMRI Listed
    • Resealable bag
    • Slow-release fertilizer for providing nutrients over time

    Great for feeding cucumbers and nightshade plants like tomatoes. One bag covers around 250 square feet of garden space.

    NPK Ratio: 8-4-8
    Fertilizer Type: Granular
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Frequently Asked Questions About Tomato Fertilizers

What is an NPK Ratio

If you remember high school chemistry class, you might remember that table of elements. It was super overwhelming, but thankfully when you’re gardening – there are only 3 main ones to pay attention to.

What Does N-P-K Stand For?

NPK isn’t just a strange slang term, it stands for:

  • N is for Nitrogen – Nitrogen helps plants grow and gives leaves their deep green color
  • P is for Phosphorus – great for helping blooms and producing healthy fruit
  • K is for Potassium – supports strong root growth and more stable plants

Depending on the nutrients already in your soil and the type of plant you’re growing, you’ll need a different NPK ratio. It can be confusing if you haven’t done a soil test lately. For the most part, an “all-purpose” type of fertilizer like this is a good option for most plants.

Around half a foot of fertilizer per 50 square feet of garden space is a good starting point. But you’ll want to take into account your specific growing conditions.

How to Pick The Right NPK Fertilizer for Tomatoes

There are a few things to consider when choosing a fertilizer for your garden. I always try and stick to an organic option when possible.

Before you choose any fertilizer, make sure you’ve gotten a soil test done so you can understand what nutrients your plants need, versus what’s already in the soil.

You might also need other nutrients aside from the NPK formulas, so it’s important to know.

MySoil - Soil Test Kit | Grow the Best Garden |Nutrient and pH Analysis

It's important to get a soil test done before choosing a fertilizer to understand what nutrients your soil is deficient in.

  • pH Analysis
  • Nutrient Analysis
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Different Types of Fertilizer

Granular

Granular fertilizers are nice because they are often a slow-release variety, meaning they can give the plants nutrients over time, instead of all at once. Since plants can’t use all of the nutrients at once, this is a big benefit to using certain granular formulas.

Fertilizer Spikes

Spikes are one of the best options for beginner gardeners. It’s hard to mess up the formulation and application instructions.

Liquid Fertilizer

Liquid fertilizer is a concentrated solution of fertilizer. Make sure to dilute with water before you apply it. I like using a backpack sprayer to make sure I can an even coating around the base of the plants.

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AUTHOR

Hi - I'm Chenell! I'm on a mission to learn how to grow my own food, and help other people do the same.

I lived in the city for almost a decade, but after moving to the suburbs, I started making my Iowa blood proud and growing all kinds of food 🌽 I started this website to help keep track of the journey while teaching others the mistakes and things I'm learning along the way. You can follow along with the journey and learn more here.

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