Lawn Fertilizer

Q: What makes professional-grade fertilizers more effective?

Professional Fertilizer will contain:Micronutrients(boron, iron, manganese, copper and zincBio-solids instead of fillers which increase organic matter and boost cec levels.Polymer-coated pearls to extend the release of nutrients to your lawn.Cheap fertilizers typically will not contain any slow-release nutrients, and are mostly fillers.

A white bag of Lawn Synergy Starter 15-20-10 professional lawn fertilizer with green geometric accents and branding.

RECOMMENED NOW

Emerald 10-0-20

Tall Fescue, Kentucky Bluegrass, Zoysia, St. Augustine, and Centipede Lawns.

RECOMMENED NOW

Almighty 20-0-10

Bermuda Lawns & Lawns needing more growth.

Seeding or Sod

Starter Fertilizer

The Key to Faster Germination & Stronger Roots

Organics Option

BioBoost

Build up organics within the soil while also feeding the lawn.

Measure Your Lawn

Order the correct amout of product based on the sq ft of your lawn.

Spreader Settings

Common spreader settings for various lawn products.

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Shop by Category

Feed your lawn for season-long results.

Grass Seed

Clean weed-free seed for a ultra-dark green lawn.

Weed Control

Clean up pesky weeds that don't belong in your lawn.

Fungicide

Prevent and cure disease in your lawn and ornamentals.

Insecticide

Don't let insects destroy your lawn. Treat ticks mosquitos, and more.

Shop By Lawn Type

Tall Fescue

Bermuda

Zoysia

St. Augustine

Centipede

Northern Lawns

Not sure what your lawn needs?

Join our Lawn of the Year Program and take the guesswork out of lawn care. We’ll deliver the right products at the right time, so your lawn gets exactly what it needs all season long.

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How It Works

1

Choose Your Lawn

Tell us your lawn type and goals.

2

Get Your Program

We recommend the right products and timing.

3

Apply With Confidence

Simple steps for a thicker, greener lawn.

1

Choose Your Lawn

Tell us your lawn type and goals.

2

Get Your Program

We recommend the right products and timing.

3

Apply With Confidence

Simple steps for a thicker, greener lawn.

Looking for the best lawn fertilizer to grow thick, dark green grass? Lawn Synergy offers professional-grade lawn fertilizer built for homeowners who want real results — not average big box performance. Every blend is formulated to perform on your lawn using premium nitrogen sources, micronutrients, and organic components designed for consistent color, steady growth, and stronger turf.

Professional Lawn Fertilizer That Delivers Results

Your lawn needs to be constantly fed. Without proper feeding, grass thins, loses color, and becomes vulnerable to weeds, heat, and disease. Our fertilizers for grass are engineered to correct deficiencies, improve density, and produce the deep green color high-end lawns are known for.

We use a strategic combination of:

XCU Slow-Release Nitrogen – Controlled feeding without excessive growth surges. Lasts up to 8-10 weeks.
Ammoniacal Nitrogen – Fast green-up and immediate response.
Micronutrients – Enhanced dark green color including iron.
Organic-Enriched Components – Improved soil performance and nutrient efficiency.

The result? Consistent growth, better stress tolerance, and a lawn that looks professionally maintained.

Understanding N-P-K in Lawn Fertilizer

Every fertilizer bag lists three numbers — N-P-K — representing Nitrogen, Phosphorus, and Potassium.

Nitrogen (N) drives top growth and rich green color.
Phosphorus (P) supports root development and new seed establishment.
Potassium (K) improves drought tolerance, disease resistance, and overall durability.

Our lawn fertilizers are precisely balanced with performance-driven N-P-K ratios based on grass type and season, so you’re always applying the right nutrients at the right time.

Granular vs. Liquid Lawn Fertilizer

Both granular and liquid fertilizer have their place. Liquid fertilizers provide quick visual response but require frequent applications. They are great for spoon feeding. Granular lawn fertilizer offers longer-lasting feeding and more consistent nutrient delivery — making it the preferred choice for most homeowners and lawn pros.

Our turf-grade granules spread evenly for professional results without streaking or patchiness. Need help with spreader settings?

Why Choose Lawn Synergy Lawn Fertilizer?

Formulated for Real Lawns – We have designed these formulations based on 30+ years of experience. Learn more about us.
Premium Nitrogen Technology – XCU + ammoniacal nitrogen for controlled, efficient feeding. Feeds lawn slowly.
Micronutrient Enhanced – Deeper green color and improved turf health. Box store fertilizers don't contain micros...
Organic-Enriched Blends – Support soil performance and nutrient uptake.
Professional-Grade Results – The same level of performance used on high-end residential lawns.

Fertilizer for Every Grass Type

We carry lawn fertilizer for Tall Fescue, Kentucky Bluegrass, Ryegrass, Bermuda, Zoysia, St Augustine, and Centipede turf types, with seasonal options for spring green-up, summer stress protection, fall recovery, and winter feeding.

Buy Lawn Fertilizer Online

If you're searching for where to buy lawn fertilizer online, Lawn Synergy delivers professional-grade products directly to your door. No gimmicks. No filler ingredients. Just high-performance fertilizer that helps you grow beyond green.

Need guidance? Visit our Lawn Guides for expert tips and seasonal lawn care strategies. Or Contact us! We have live support available anytime to help with your lawn.

Current Best Sellers

Headway G Fungicide

$78.95

Prevent and cure disease

Emerald 10-0-20 Lawn Fertilizer

$39.99

Low nitrogen stress blend

Almighty 20-0-10 Lawn Fertilizer

$39.99

High nitrogen for growth

Bifen 7.9F Insecticide

$29.95

Treats insects and mosquitos

Pro-Grade Products

Fast Shipping

DIY Friendly

Expert Support

Got Questions?

Frequently Asked.

How often should I fertilize my lawn?

Granular fertilizer is designed to last 6-8 weeks. However, we recommend applying every 6 weeks during the growing season to keep your lawn continuously fed.

Can these fertilizers be used on all types of grass?

Yes, however each lawn type has its preferences such as the amount of nitrogen, etc.

Bermuda and Zoysia lawns require more nitrogen. We suggest 20-0-10 and 10-0-20 during the summer months.

Cool season lawns require high nitrogen in fall. We suggest 20-0-10 and during the summer months, 10-0-20.

What makes professional-grade fertilizers more effective?

Professional Fertilizer will contain:

Micronutrients(boron, iron, manganese, copper and zinc
Bio-solids instead of fillers which increase organic matter and boost cec levels.
Polymer-coated pearls to extend the release of nutrients to your lawn.

Cheap fertilizers typically will not contain any slow-release nutrients, and are mostly fillers.

What fertilizer makes grass dark green?

Well, we have quite a few of them. Most of our lawn fertilizers contain iron which will really deepen the green color of your lawn. Both our 10-0-20 and 20-0-10 contain iron and micronutrients. If you have recently fertilized and would like to try adding micronutrients without nitrogen, apply Nutrigreen 0-0-4.

What is the best fertilizer to use on a lawn?

Lawn Synergy Fertilizer is the best fertilizer for lawns. Why? Because we have developed each analysis based on what your lawn actually needs. We do not focus on price, we eliminate fillers and we focus on nutrition that your lawn needs to thrive.