10 Best Lawn Fertilizer With High Potassium of 2025

Tested and Reviewed: Top 10 Lawn Fertilizer With High Potassium deals with expert ratings from 8.1 to a perfect 10

March 2026 Edition

Editor's Choice

9.7

Simple Lawn Solutions

Simple Lawn Solutions - High Potassium Lawn Food Liquid Fertilizer 0-0-25 - Concentrated Spray - Turf Grass Vigor and Plant Hardiness - Summer and Fall - Any Grass Type (32 Ounce)

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Editor's bottom line:

“This lawn fertilizer with high potassium is the best one we tested. In terms of quality, brand and price, we couldn't ask for more.”

Main Highlights

Plant Hardiness: Potassium Promotes Turf Grass Hardiness, Helping Lawns Prepare For Temperature Change and Stressful Conditions. Potassium Deficient Lawns Can be Less Resistant to Stress. Great to use in the Summer and Fall.
High Potassium Lawn Food Fertilizer: Treats Potassium Deficiency. Potassium Can Enhance The Plants Endurance to Stress if a Deficiency is Present. Potassium is involved in Carbohydrate Formation, Photosynthesis, Enzyme Activation, and the Formation of Proteins. The Application of Potassium will Generally Not Show a Visible Response.
Easy to Use: Our 0-0-25 Lawn Fertilizer Food Comes With a Ready-To-Use Hose End Sprayer that Applies the Perfect Ratio of Liquid Nutrients for Lawn Applications. Covers up to 3,200 Square Feet, when Using the Attached Sprayer.
Produced In The U.S.A: 0-0-25 is Manufactured in the United States of America, by a Family Owned Business with over 25 Years of Former Experience in the Commercial Professional Turf and Agriculture Industry.
Can Be Used On Any Grass type: Saint Augustine Grass, Bahia Grass, Bermuda Grass, Centipede Grass, Kentucky Bluegrass, Annual Ryegrass, Perennial Ryegrass, Tall/Fine Fescues, Zoysia Grass, and more!

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Picked by 397 people today

9.5

Simple Lawn Solutions

Simple Lawn Solutions - High Potassium Lawn Food Liquid Fertilizer 0-0-25 - Concentrated Spray - Turf Grass Vigor and Plant Hardiness - Summer and Fall - Any Grass Type (1 Gallon)

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Main Highlights

Plant Hardiness: Potassium can promote turfgrass hardiness, helping lawns prepare for temperature changes and stressful conditions. Potassium deficient lawns can be less resistant to stress. Great to use in the Summer and Fall.
High Potassium Lawn Food Fertilizer: Treats Potassium deficiency. Potassium can enhance the plants endurance to stress if a deficiency is present. Potassium is involved in carbohydrate formation, photosynthesis, enzyme activation, and the formation of proteins. The application of Potassium will generally not show a visible response.
0-0-25 Lawn Fertilizer Food covers 12,800 square feet when using a hose-end sprayer: Refill 0-0-25 hose end sprayer or use with a third party Sprayer, Backpack Sprayer, Spray Tank or Pump-up Sprayer.
Produced In The U.S.A: 0-0-25 is manufactured in the United States of America, by a family-owned business with over 25 Years of former experience in the commercial professional Turf and Agriculture Industry.
Can Be Used On Any Grass Type: St. Augustinegrass, Bahiagrass, Bermudagrass, Centipedegrass, Kentucky Bluegrass, Annual Ryegrass, Perennial Ryegrass, Tall/Fine Fescues, Zoysiagrass, and more!

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9.5

The Andersons

The Andersons Professional Potassium Fertilizer 0-0-25-18 lbs. Covers up to 6,000 sqft.

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Main Highlights

Ideal for lawns with potassium deficiencies
Use as a supplement to your existing feeding program
Can be used any time during the growing season
Small particle size for complete and uniform coverage
Safe for all turf types. Not for sale in CA

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9.2

Simple Lawn Solutions

Ultimate 3-18-18 NPK- Lawn Food Quality Liquid Fertilizer- Easy to Use Concentrated Spray- Any Grass Type- Summer & Fall Nutrients- Simple Lawn Solutions - Turf Hardiness & Root Vigor (32 Ounce)

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Main Highlights

High Phosphorus, High Potassium Lawn Food: If your lawn is showing symptoms of a Phosphorus and Potassium deficiency or if you want to maintain lawn health then this is the correct fertilizer for you!
Made With High Quality Feed Grade Ingredients: Nourish your lawn to its top potential with quality liquid lawn Nutrients.
Easy To Use: Designed to be easily applied. This high Phosphorus & Potassium Lawn Food gives your lawn the nutrients it needs for strong root development, vigor, and strength.
Can Be Used on All Grass Types: Including Bermuda, St. Augustine, Zoysia, Buffalo, Centipede, Palmetto & Bluegrass Lawns.
Easy to Use: Our 3-18-18 Lawn Fertilizer Food comes with a ready-to-use hose end sprayer that applies the perfect ratio of product for lawn applications. Covers up to 3,200 square feet, when using the attached sprayer.
Great Starter Fertilizer: High Phosphorus and Potassium Lawn Food provides essential Phosphorus to promote plant development, and is highly recommended when establishing a lawn.
Contains 3% Nitrogen. Low Nitrogen Formula. Nitrogen can encourage growth for the development of a dense, attractive lawn.
Contains 18% Phosphorus. Phosphorus encourages root development, and is essential for turf establishment. Phosphorus effects on turf are usually more subtle and, while not as readily visible, are still very important.
Contains 18% Potassium. Potassium can enhance the plants endurance to stress if a deficiency is present. The application of Potassium will generally not show a visible response.
Produced In The USA: 3-18-18 is Manufactured in the United States of America, by a Family Owned Business with over 25 Years of Former Experience in the Commercial Professional Turf and Agriculture Industry.

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9.0

Simple Lawn Solutions

Superior 15-0-15 Liquid Lawn Fertilizer - Lawn Food for Growth & Green - Nitrogen, Potassium, Humic, Fish & Seaweed - Any Grass Type- Simple Lawn Solutions - All Season- Attached Sprayer (32 Ounce)

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Main Highlights

15-0-15 Lawn Fertilizer To Promote Greening, Growth And Turf Hardiness: The Power Of Nitrogen & Potassium Blended With Humic, Fish And Seaweed. Intensify Green And Growth While Providing Key Nutrients For Turf Hardiness.
Can Be Used On All Grass Types: Lawn Fertilizer For Bermuda Grass, St. Augustine Grass, Zoysia Grass, Tall Fescue, Fine Fescue & Kentucky Bluegrass.
Liquid Lawn Fertilizer: 15-0-15 Nutrient Ratio Provides Balanced Nutrients For Overall Lawn Vigor. Liquid Fertilizer For Spring, Summer And Fall.
Nitrogen Lawn Fertilizer: Nitrogen Encourages Vigorous Growth For The Development Of A Dense Green Attractive Lawn. Nitrogen Is The Most Essential Macronutrient For Turf.
Potassium Fertilizer For Lawns: Potassium Can Enhance The Plants Endurance To Stress If A Deficiency Is Present. This Concentrated Liquid Fertilizer Provides Essential Nutrients.
15-0-15 Fertilizer Blended With Humic, Fish And Kelp: Our Humic Is Derived From The Highest Quality Humate Source, Leonardite. Our Ascophyllum Nodosum Seaweed Harvested In The Icy North Atlantic.
Attached Easy To Use Sprayer: 15-0-15 Liquid Lawn Food Comes With An Attached Ready To Use Sprayer. Hook To Your Hose To Apply. Covers 3,200 Square Feet.
Use Alongside Fertilizer Program. 15-0-15 Liquid Fertilizer Can Be Used With Your Current Fertilizer Program For A Quick Nutrient Uptake.
Produced In The United States: 15-0-15 Is Manufactured In The United States Of America, By A Family Owned Business With Over 25 Years Of Former Experience In The Commercial Professional Turf Industry.

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8.8

The Grow Co

Muriate of Potash 0-0-60 Fertilizer, High Potassium Fertilizer for Plants, Ideal Plant Food & Potash Fertilizer for Plants - Boosts Growth of Turf, Shrubs, Trees, Flowers, Fruits & Vegetables, 5 lb

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Main Highlights

PREMIUM POTASH FERTILIZER: Derived from premium muriate of potash, our crystal-form potassium plant fertilizer is concentrated & helps in the formation & transfer of sugar & other plant nutrients.
HIGH POTASSIUM FERTILIZER: Unlike other potash fertilizers, ours has a 0-0-60 ratio to ensure you get adequate potassium for plants, helping them grow resilient and fight potassium deficiency.
DROUGHT & STRESS PROTECTION: This garden fertilizer reduces moisture loss, grows stronger stems & promotes thickened outer cell walls, making plants resilient to drought & environmental stress.
BEAUTIFUL, GREENER TURF: Acts as a lawn fertilizer or fertilizer for grass that makes the grass grow greener & build thicker cell walls to stay healthy & strong to withstand drought, heat, and cold.
BIGGER PLANTS & HARVESTS: Our fertilizer increases the density of crop yields, leaves & blooms. It works great as a grass fertilizer for lawn, fruit tree fertilizer, flowers & vegetable plant food.
EASY TO USE: Mix Apply 1/2 lb. (1.25 cups) per 1,000 sq. ft. into the top one inch of soil and water plants thoroughly. For individual plants, apply 1 tsp near the drip line for enhanced growth.

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8.6

Simple Lawn Solutions

Simple Lawn Solutions - High Potassium Lawn Food Liquid Fertilizer 0-0-25 - Concentrated Spray - Turf Grass Vigor and Plant Hardiness - Summer and Fall - Any Grass Type (2.5 Gallon)

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Main Highlights

Plant Hardiness: Potassium can promote turfgrass hardiness, helping lawns prepare for temperature changes. Potassium-deficient lawns can be less resistant. Great to use in the Summer and Fall.
High Potassium Lawn Food Fertilizer: Potassium can enhance the lawns endurance if a deficiency is present. The application of Potassium will generally not show a visible response.
0-0-25 Lawn Fertilizer Food covers 32,000 square feet when using a hose-end sprayer: Refill 0-0-25 hose-end sprayer or use with a third party Sprayer or Backpack Sprayer.
Can Be Used On Any Grass Type: St. Augustinegrass, Bahiagrass, Bermudagrass, Kentucky Bluegrass, Ryegrass, Tall Fescue, Fine Fescue, Zoysiagrass, and more.
Produced In The U.S.A: 0-0-25 is manufactured in the United States of America, by a family-owned business with over 25 Years of former experience in the commercial professional Turf and Agriculture Industry.

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8.3

Simple Lawn Solutions

Advanced 16-4-8 Balanced NPK - Lawn Food Quality Liquid Fertilizer - Spring & Summer Concentrated Spray - Any Grass Type - Simple Lawn Solutions (32 Ounce)

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Main Highlights

Complete NPK Lawn Food: 16-4-8 is the perfect blend of key macronutrients. This lawn liquid food turf fertilizer also contains Seaweed & Fish.
Contains High Quality Feed Grade Ingredients: Nourish your lawn with pure liquid Nutrients in a ready to use sprayer
Easy To Use: Designed to be easily applied. This complete Nitrogen, Phosphate and Potash formula gives your grass greening & growth while providing nutrients for lush lawns
All Grass types: Including Bermuda, St. Augustine, Zoysia, Buffalo, Centipede, Florida Palmetto, Bahia, Fescue, Ryegrass & Kentucky Bluegrass
Produced In The United States: 16-4-8 is manufactured in the United States of America, by a family owned business with 25 years of former experience in the commercial professional turf industry.
Blended with 16% Nitrogen. Nitrogen is a major component of chlorophyll where plants get their green coloring. Nitrogen encourages vigorous growth for the development of a dense attractive lawn.
Blended with 4% Phosphorus. Phosphorus encourages root development, and enhances vigorous plant development in early stages.
Blended with 8% Potassium. Potassium enhances plant tolerance to extreme temperatures and drought, while also playing an essential role in the transfer of nutrients and regulation of water and nutrients.
Contains Seaweed and Fish. Seaweed & Fish Emulsion provides rich, organic matter to soil for a more effective Lawn Food and optimum nutrient uptake.
16-4-8 Lawn Food is best to be used to maintain and feed your lawn, if you want to enhance the green of your lawn, if you are trying to boost vertical and lateral growth, and/or if your lawn is deficient in Macronutrients like Nitrogen, Phosphorus and Potassium.

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8.1

Scotts

Scotts Green Max Lawn Food - Lawn Fertilizer for Grass Plus Iron Supplement, 5,000 sq. ft., 16.67 lbs.

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Main Highlights

DUAL-ACTION FORMULA: Scotts Green Max Lawn Food is a 2-in-1 grass fertilizer plus iron supplement that feeds your lawn and provides deep greening in just 3 days
QUICK, GREEN RESULTS: This lawn care product contains 5% iron, a micronutrient that enhances the greening process for fast results
APPLICATION: Apply this fertilizer plus iron supplement for green grass to any grass type in the spring, summer, or fall
NO STAINING: Guaranteed not to stain concrete, driveways, or other surfaces surrounding your lawn (when used as directed)
PEOPLE & PETS DON'T NEED TO WAIT: OK to re-enter lawn immediately after product is applied
COVERAGE: One 16.67 lb. bag of Scotts Green Max Lawn Food for greener grass covers 5,000 sq. ft.

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8.1

Supply Solutions

Supply Solutions Muriate of Potash 0-0-60 Fertilizer, High Potassium Fertilizer, Potassium for Plants, Ideal Plant Food & Potash for Plants - for Lush Crops, Blooms, Acidic Plants (50lbs)

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Main Highlights

Promotes the Development of Lush Foliage: Formulated with potash fertilizer 0-0-60 for plants blend balanced high potassium fertilizer formula that ensures optimal nutrient uptake for your plants, for healthy and stunning foliage.
High-Grade Potassium Granular Fertilizer: This potassium for plants is crafted to elevate the density of your flowers, fruits and vegetables. The increased potassium content boosts nutrient absorption, strengthening plant structure and resilience to stress.
Fortifying Plant Roots:This high potash fertilizer enables plants to efficiently absorb water and nutrients from the soil. With soluble potassium plant food, your plants receive the essential potassium they need to thrive, resulting in stronger stems.
Valuable Resource Healthy lawns and Gardens: Potassium sulfate fertilizer that helps improve drought tolerance. Encourages the synthesis of carbohydrates, promoting energy transfer within the plant and for the production of vibrant foliage and blooms.
Floral, Crops and Fruit Development: Potassium for lawn that levates the plant's ability to absorb water, nutrients, and from the soil. Ensures that plants have the support they need leading to more productive crops or vibrant blooms in plants.

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Our Best Overall Choice

Best Choice

9.7

Simple Lawn Solutions

Simple Lawn Solutions - High Potassium Lawn Food Liquid Fertilizer 0-0-25 - Concentrated Spray - Turf Grass Vigor and Plant Hardiness - Summer and Fall - Any Grass Type (32 Ounce)

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Editor's bottom line:

“This is the best one we tested. In terms of quality, brand and price, we couldn't ask for more.”

Main Highlights

Plant Hardiness: Potassium Promotes Turf Grass Hardiness, Helping Lawns Prepare For Temperature Change and Stressful Conditions. Potassium Deficient Lawns Can be Less Resistant to Stress. Great to use in the Summer and Fall.
High Potassium Lawn Food Fertilizer: Treats Potassium Deficiency. Potassium Can Enhance The Plants Endurance to Stress if a Deficiency is Present. Potassium is involved in Carbohydrate Formation, Photosynthesis, Enzyme Activation, and the Formation of Proteins. The Application of Potassium will Generally Not Show a Visible Response.
Easy to Use: Our 0-0-25 Lawn Fertilizer Food Comes With a Ready-To-Use Hose End Sprayer that Applies the Perfect Ratio of Liquid Nutrients for Lawn Applications. Covers up to 3,200 Square Feet, when Using the Attached Sprayer.
Produced In The U.S.A: 0-0-25 is Manufactured in the United States of America, by a Family Owned Business with over 25 Years of Former Experience in the Commercial Professional Turf and Agriculture Industry.
Can Be Used On Any Grass type: Saint Augustine Grass, Bahia Grass, Bermuda Grass, Centipede Grass, Kentucky Bluegrass, Annual Ryegrass, Perennial Ryegrass, Tall/Fine Fescues, Zoysia Grass, and more!

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