The Top 5 Biostimulants for a Lush, Green Lawn (And How to Use Them the Right Way)
If your lawn looks “okay” but never quite hits that deep, golf-course green, chances are you’re feeding it… but you’re not stimulating it.
That’s where lawn biostimulants come in.
Unlike traditional fertilizers that simply supply nutrients, biostimulants for lawns enhance soil biology, root growth, nutrient uptake, and stress tolerance. They help your grass use what’s already in the soil more efficiently — and recover faster from heat, drought, mowing stress, and foot traffic.
In this guide, we’ll cover:
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What lawn biostimulants actually do
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Why they’re critical for long-term turf health
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The best biostimulants for lawns that are available at Golf Course Lawn
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When and how to apply each one
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A side-by-side comparison table so you know exactly what to use.
And yes — all of these are safe for both warm-season and cool-season lawns when used as directed.
What Are Lawn Biostimulants?
Biostimulants for lawns are products made from natural or biologically active ingredients that enhance plant growth and soil function.
Unlike fertilizers, lawn biostimulants are products made from biologically active ingredients like:
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Carbon sources
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Seaweed extracts
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Organic acids
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Beneficial microbes
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Micronutrients.
Instead of directly feeding turf like a fertilizer, they:
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Stimulate soil microbial life
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Improve nutrient cycling
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Enhance root development
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Increase drought and heat tolerance
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Improve soil structure.
Think of fertilizer as food and biostimulants as a personal trainer and gut-health program for your lawn. Together, they create a truly lush green lawn.
Related: How Plant Growth Regulators Can Make Your Lawn Thicker and Greener
Why Use Biostimulants for Lawn Health?
If you’re trying to grow a lush green lawn, biostimulants help by:
1. Building stronger roots: Deeper roots = better drought tolerance and nutrient absorption.
2. Improving soil biology: Healthy soil microbes break down nutrients and make them more available to grass.
3. Increasing stress tolerance: Heat, heavy rain, foot traffic — biostimulants help turf bounce back faster.
4. Enhancing nutrient efficiency: You get more from every pound of fertilizer you apply.
That’s why improving lawn health with biostimulants has become standard practice on golf courses — and now homeowners can use the same tools.
The Top 5 Biostimulants for a Lush, Green Lawn
CarbonizPN-G™ — Granular Soil Carbon Biostimulant
If your lawn struggles despite regular fertilization, the issue often isn’t what you’re feeding it — it’s the soil itself.
Formerly known as Essential-G™, CarbonizPN-G™ is a granular carbon-based soil biostimulant designed to build biological activity and long-term fertility in your lawn’s root zone.
Unlike quick-release fertilizers, soil carbon products feed the soil food web — microbes, fungi, bacteria, protozoa — to unlock trapped nutrients and improve soil structure.
What CarbonizPN-G™ Does
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Enrich soil with organic compost and biochar
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Improve water retention
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Reduce plant stress
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Increase soil organic matter
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Support healthier turf growth
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Improve fertilizer efficiency.
Instead of forcing growth, it upgrades the soil environment that supports growth.
The Power Behind It: CarboMatrix™
At the heart of CarbonizPN-G™ is CarboMatrix™.
CarboMatrix™ is activated carbon (biochar) inoculated with premium organic materials. It’s designed to improve soil performance at the structural level.
It helps:
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Reduce soil compaction
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Drive deeper root growth
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Increase fertility
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Improve water absorption
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Decrease nutrient leaching.
When nutrient leaching decreases, fertilizer stays in the root zone longer. That means your fertilizer feeds your lawn more efficiently.
Key Ingredients
CarbonizPN-G™ contains:
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45% USDA Certified Carbon (biochar)
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45% Compost
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10% Other natural ingredients.
The blend includes premium organics and composted materials, including reclaimed waste-stream inputs, all formulated to increase soil organic matter.
More organic matter means:
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Better moisture retention
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Improved nutrient holding capacity
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Increased microbial activity
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Healthier soil structure.
Over time, this leads to stronger, more resilient turf.
What Problems It Helps Fix
CarbonizPN-G™ is ideal if you’re dealing with:
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Compacted soil
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Sandy soil with poor nutrient retention
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Clay soil with poor structure
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Shallow root systems
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Frequent drought stress
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Fertilizer that “doesn’t seem to last.”
If your lawn feels dry quickly after watering or fertilizer seems to wash through the soil, this product directly addresses those root-zone limitations.
When to Use It
✔ During active growing seasons
✔ During aeration or overseeding
✔ Anytime soil seems “slow” or lifeless
Because this is a soil-building product, timing is flexible as long as the ground isn’t frozen.
How to Apply
CarbonizPN-G™ is applied using a traditional broadcast spreader.
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Apply to a dry lawn.
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There is no need to water it in immediately. You can wait for rainfall or water it in when you apply your granular fertilizer (we recommend applying CarbonizPN-G™ before granular fertilizer).
As a general program rule:
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Apply granular products first (CarbonizPN-G™ + granular fertilizer).
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Follow with liquid products (Release, Nutri-Kelp™, Micronutrients, etc.).
If you want long-term improvement instead of short-term cosmetic results, this is where you start.
Release Zero™ & Release 901C™ — Liquid Soil Biostimulants
If you want your fertilizer to work better, your roots to grow deeper, and your lawn to handle stress more efficiently, this is where Release ZERO™ and Release 901C™ come in.
Both products are built around 10% liquid carbon, micronized nutrients, and proprietary NanoRelease™ Technology. The difference is simple:
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Release ZERO™ (0-0-0) = contains no nitrogen
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Release 901C™ (9-0-1) = includes nitrogen and potassium in addition to the biostimulant base.
Think of ZERO as a nutrient amplifier. Think of 901C as the amplifier plus visible green-up power. Both are safe for all grass types — cool- and warm-season alike.
Core Ingredients and Benefits
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10% liquid carbon helps create micro-aeration within the soil profile, encouraging deeper root growth
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Micronized nutrients with extremely small particle sizes, making them immediately available for absorption through the leaves and roots.
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NanoRelease™ Technology helps release nutrients that are already present in the soil but are unavailable to the plant. In testing, this technology was shown to be significantly more effective than traditional humic acid products at releasing bound nutrients and making them usable.
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(901C Only) Light fertility: 9% nitrogen and 1% potassium for visible green-up in 2–3 days.
Release ZERO™ focuses purely on soil and nutrient optimization without adding nitrogen.
Release 901C™ delivers the same carbon-driven soil and nutrient benefits, with added fertility for visible color and growth response.
What Problems These Products Help Fix
Both Release ZERO™ and Release 901C™ are excellent when:
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Your lawn isn’t responding to fertilizer
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Soil nutrients seem locked up
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Roots are shallow
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You’re preparing for heat or drought stress
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You want to improve soil biology
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You want to enhance the performance of fertilizers, herbicides, or pesticides.
They mix easily with liquid fertilizers, herbicides, and insecticides, and can be added to almost any spray program to improve overall performance.
There is no need to water either product in. Simply spray and allow it to dry.
When to Use Them
✔ Early Spring to jump-start microbial activity
✔ Summer for stress recovery
✔ After mowing or light rainfall
✔ As part of a regular rotation with other biostimulants
Both are safe for cool- and warm-season grasses and perfectly suited for turf under heat or drought stress. Use Release Zero™ if you’re already spoon-feeding fertilizer. Use Release 901C™ if you want a light fertility boost included.
How to Apply
We recommend foliar spraying with a battery-powered 4-gallon sprayer with a TeeJet foliar spray tip.
Example: 4,000 sq ft lawn
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Fill the tank halfway with water
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Add 8 fluid ounces of product
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Add additional products if desired (Nutri-Kelp™, fertilizer, etc.)
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Agitate
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Fill the tank to full
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Agitate again
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Spray evenly over 4,000 sq ft.
Tip: If using 901C™ and a fertilizer in the same program, adjust nitrogen rates to avoid overfeeding.
Nutri-Kelp™ — Advanced Sea Kelp Biostimulant with NanoRelease™ Technology
If you’ve ever used kelp before, you already know it’s one of the most powerful natural biostimulants available.
But Nutri-Kelp™ takes traditional seaweed products to a completely different level.
This isn’t just kelp extract in water. It’s a liquid fertilizer and biostimulant built around Norwegian sea kelp, enhanced with vitamins, enzymes, organics, essential nutrients, micronized carbon, potassium, and proprietary NanoRelease™ Technology.
What’s Inside Nutri-Kelp™?
Nutri-Kelp™ contains:
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Norwegian sea kelp
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Vitamins and enzymes
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Organic compounds
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Essential nutrients
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Micronized carbon
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Potassium
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Fulvic-style nutrient enhancers
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NanoRelease™ Technology.
Analysis: 1-1-4.
That 1-1-4 ratio provides a light nutrient boost, but the real power of Nutri-Kelp™ is how it stimulates plant function — not just feeds it.
What Problems It Helps Fix
Nutri-Kelp™ is especially valuable when your lawn is under pressure.
It helps with:
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Heat stress
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Drought stress
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Mid-summer thinning
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Slow recovery after mowing or herbicide use
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Weak root systems
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General plant fatigue.
It increases stress and disease resistance by strengthening plant structure and improving nutrient efficiency.
This is one of the best biostimulants for lush green lawn performance during harsh summer conditions.
When to Apply Nutri-Kelp™
✔ During active growing months
✔ Summer stress periods
✔ Post-herbicide applications to help recovery.
It’s friendly to all grass types — cool- and warm-season — and complements nutrient programs rather than replacing them.
How to Apply Nutri-Kelp™
We recommend applying Nutri-Kelp™ via foliar spray.There is no need to water it in after application. The nutrients are absorbed directly through the leaf surface.
It can be applied alone or tank mixed with other products. We’ve tested Nutri-Kelp™ with our liquid fertilizers and biostimulants and observed no adverse interactions. As always, confirm compatibility with a simple jar test if mixing with new products.
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Fill the sprayer tank halfway with water.
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Add 8 fluid ounces of Nutri-Kelp™ to the tank.
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Add additional products (fertilizer, Release 901C™, etc.) if desired.
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Agitate tank.
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Fill the tank to full with water.
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Agitate again.
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Spray evenly over 4,000 sq ft.
We recommend a battery-powered 4-gallon sprayer with a TeeJet foliar spray tip for best coverage.
Related: What Are the Benefits of Using Liquid Kelp on Your Lawn?
ByoSpxtrum™ — The Soil Biology Supercharger
If CarbonizPN-G™ builds soil structure and Release products improve nutrient efficiency, ByoSpxtrum™ is the product that wakes up your soil biology and puts it to work.
ByoSpxtrum™ is packed with a proprietary blend of beneficial microbes and nutrients designed to increase microbial diversity — not just add a couple of “super strains,” but deliver the wide range of biology plants actually need.
And here’s the key: plants don’t thrive on just a few bacteria or fungi. They need a broad, complex microbial ecosystem. That’s exactly what ByoSpxtrum™ provides.
What’s Inside and Why It Matters
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Beneficial microbes: Help cycle nutrients and break down thatch and organic matter
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Bio-stimulatory carbon: Feeds microbes over time
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Microbial growth factors: Enhance microorganism efficiency.
The microbes in ByoSpxtrum™ activate to full life in seconds. That’s because of the proprietary process used to prepare them — it avoids stunning or harming the organisms, so they’re ready to go to work as soon as they hit the soil.
The formulation is:
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100% non-GMO
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Non-synthetic
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Non-toxic
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Approved for use on certified organic crops.
This isn’t a synthetic lab blend. It’s designed to restore real soil function.
How It Improves Lawn Performance
The complex microbial blend in ByoSpxtrum™:
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Boosts soil nutrient availability
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Enhances fertilizer efficiency
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Improves root development
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Supports plant growth at all stages
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Strengthens long-term soil biology
It doesn’t force growth. It improves the system that supports growth.
When to Use ByoSpxtrum™
✔ During active growing months
✔ Anytime you're spraying a liquid product on your lawn — fertilizer, herbicide, insecticide, Nutri-Kelp™, Release ZERO™, etc. — you can include ByoSpxtrum™ in the tank.
✔ Fall root-building periods
✔ When soils are compacted or biologically tired
It’s safe for all turf types — cool- and warm-season included — and especially helpful where soil is limiting growth.
How to Apply
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Use a 4-gallon backpack sprayer with a TeeJet foliar spray tip.
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Before adding it to your sprayer, it needs to be suspended in a small amount of water.
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Fill the sprayer tank halfway with water
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Mix 1 tablespoon (.25 dry ounces) of ByoSpxtrum™ with 20 ounces of water
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Add that mixture to the sprayer tank.
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Add additional products (fertilizer, Nutri-Kelp™, Release ZERO™, etc.).
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Agitate the tank.
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Fill the tank the rest of the way with water.
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Agitate again.
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Spray the full 4-gallon mixture evenly over 4,000 sq ft.
Tip: Pair ByoSpxtrum™ with CarbonizPN-G™ for a powerful soil-building combo.
Golf Course Lawn Micronutrient Blend (With Fulvic Acid and Kelp)
If you want fast color, improved nutrient efficiency, and better overall plant metabolism, this is one of the most powerful tools in your program.
Golf Course Lawn Micronutrient Blend is our custom-formulated blend of Boron, Copper, chelated Iron, Molybdenum, Manganese, and Zinc — delivered in the same ratio they naturally occur inside the plant.
This product is designed specifically for foliar uptake. That means the nutrients are absorbed directly through the leaf blade — not through the soil.
No waiting on soil biology. No worrying about soil pH. No watering it in. Just spray it and let the plant absorb what it needs.
You can expect visible results — especially color improvement — within 2 to 3 days.
Key Nutrients Inside
Grass needs more than nitrogen, phosphorus, and potassium. Our Micronutrient blend contains:
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Boron (B) – 0.08%
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Copper (Cu) – 0.25%
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Iron (Fe) – 2.00%
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Manganese (Mn) – 2.00%
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Molybdenum (Mo) – 0.001%
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Zinc (Zn) – 0.75%.
These micronutrients are critical for:
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Chlorophyll production
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Enzyme activation
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Hormone regulation
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Root metabolism
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Overall turf vigor.
If your lawn looks pale even though you’ve applied nitrogen, it’s often a micronutrient imbalance — especially iron or manganese.
This blend also includes:
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Fulvic acid (1.5%)
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Kelp extract (1.5%).
Fulvic acid improves nutrient transport inside the plant and enhances uptake efficiency. It helps chelate and stabilize micronutrients, enabling them to move more effectively into plant tissues.
The added kelp extract introduces natural plant hormones that:
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Improve nutrient absorption
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Stimulate root growth
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Enhance stress tolerance.
So you’re not just correcting deficiencies — you’re improving plant performance.
When to Use It
✔ During spring green-up
✔ Throughout the growing season
✔ Alongside liquid fertilizers
✔ With biostimulant programs.
Topdressing and aeration do not reduce effectiveness since the product is absorbed through the leaf. Ideal for both cool-season and warm-season lawns.
How to Apply
We recommend applying via foliar spray using:
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A TeeJet foliar spray tip for optimal coverage
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Rate: 6 ounces per 1,000 square feet
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Watering: There is no need to water it in after application. Simply spray and allow the foliage to dry.
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Mixability: It can be applied alone or tank-mixed with other products. We’ve tested it alongside our liquid fertilizers and biostimulants with no adverse interactions. If mixing with new products, always confirm compatibility with a simple jar test first.
Avoid applying in extreme heat — early morning or evening is best.
Related: The Lawn Care Products You Should Buy Now for Spring
Biostimulant Comparison Table: What’s Best for Your Lawn?
| Product | Primary Purpose | Best For Fixing | Key Technology / Ingredients | Application Type |
|---|---|---|---|---|
| CarbonizPN-G™ | Soil structure & organic matter builder | Compacted soil, sandy soil, poor water retention, fertilizer leaching | 45% biochar (CarboMatrix™), 45% compost, organic soil amendments | Granular (broadcast spreader) |
| Release ZERO™ (0-0-0) | Nutrient optimizer and soil biology booster | Poor fertilizer response, shallow roots, nutrient lock-up | 10% liquid carbon, micronized nutrients, NanoRelease™ Technology | Liquid foliar spray |
| Release 901C™ (9-0-1) | Biostimulant + fertility boost | Pale turf, thin growth, need visible green-up | 10% liquid carbon, micronized nutrients, NanoRelease™ Technology | Liquid foliar spray |
| Nutri-Kelp™ (1-1-4) | Stress protection and root stimulation | Heat stress, drought stress, weak roots | Norwegian sea kelp, micronized carbon, potassium, NanoRelease™ | Liquid foliar spray |
| ByoSpxtrum™ | Microbial diversity and soil ecosystem restoration | Biologically tired soil, post-fungicide recovery, slow thatch breakdown | Broad-spectrum beneficial microbes, organic growth enhancers | Liquid tank mix |
| Golf Course Lawn Micronutrient Blend | Rapid color and metabolic support | Pale/yellow grass, iron deficiency, high pH nutrient lock-up | Chelated Iron, Mn, Zn, Cu, B, Mo + Fulvic Acid + Kelp | Liquid foliar spray (no water-in needed) |
Quick Decision Guide
If your lawn problem is:
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Compacted or poor soil structure → CarbonizPN-G™
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Fertilizer not lasting or underperforming → Release ZERO™
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You want visible green-up fast → Release 901C™
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Summer heat stress or drought → Nutri-Kelp™
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Soil biology depleted or post-fungicide → ByoSpxtrum™
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Grass looks pale despite feeding → Micronutrient Blend.
These products can be used together, so that you can mix and match depending on your lawn’s needs.
As a more economical way to bring the same products you’ve seen us using to your door, we’ve partnered with Mirimichi Green to create the Golf Course Lawn Carbon Kit. It consists of 3 products: Release ZERO™ or Release 901C™, Nutri-Kelp™, and ByoSpxtrum™.
Frequently Asked Questions About Lawn Biostimulants
Do lawn biostimulants replace fertilizer?
Short answer? No — and they’re not supposed to.
Think of fertilizer as the food your lawn eats. Biostimulants are what help your lawn digest that food properly. They improve the efficiency with which your grass absorbs nutrients, the growth of roots, and the activity of soil microbes. When you combine fertilizer with the right lawn biostimulants, you’re not just feeding your grass — you’re helping it function better overall.
If you stop fertilizing completely and only use biostimulants, your lawn will eventually run out of nutrients. But when you use both together, that’s when you see real improvements in color, density, and resilience.
How long does it take to see results from biostimulants?
It depends on what you’re using and what your lawn needs.
If you’re applying micronutrients like iron, you might notice a darker green color within a few days. Seaweed-based products often help with stress recovery within a week or two. Carbon and microbial soil builders take longer because they’re working underground, improving soil biology. Those benefits tend to build gradually over several weeks.
The key thing to understand is that biostimulants aren’t designed to give you that quick nitrogen surge. They build steady, long-term improvement. It’s more of a “stronger every week” kind of result than an overnight transformation.
Can I apply biostimulants and fertilizer at the same time?
In most cases, yes — and they actually work very well together.
Biostimulants often improve how efficiently fertilizer is used, meaning you may get better results from the same amount of nutrients. Just make sure you follow the product labels and avoid overloading nitrogen if you’re using something like Release 901C™, which already includes some fertility.
If you’re spraying liquids, many of these products can be applied during the same application window, but always double-check compatibility before tank-mixing.
Are lawn biostimulants safe for pets and children?
Most biostimulants are considered very low risk because they’re typically made from carbon sources, seaweed extracts, micronutrients, or beneficial microbes. They’re very different from high-salt synthetic fertilizers.
That said, you should always follow the label instructions. As a general rule, once a liquid product has dried or a granular product has been watered in, it’s safe to resume regular activity on the lawn.
Do biostimulants help with lawn disease?
They don’t directly kill disease organisms — that’s what fungicides are for.
What biostimulants do is strengthen the lawn itself. They encourage deeper roots, stronger cell walls, and more active soil biology. A healthier lawn is naturally more resilient and better able to tolerate stress and disease pressure.
If you already have an active fungal outbreak, you’ll likely need a fungicide. But if you want to reduce long-term vulnerability, improving lawn health with biostimulants is a smart move.
Can biostimulants help reduce thatch?
They can help over time, but they’re not a magic dethatching tool.
Some carbon-based and microbial products, such as ByoSpxtrum™, stimulate organisms that break down organic matter in the soil. That means they can gradually support the decomposition of thatch. However, if you have a thick thatch layer already built up, mechanical removal, such as core aeration or dethatching, is still necessary.
Think of biostimulants as helping prevent future buildup rather than instantly solving a heavy thatch problem.
Will biostimulants work in sandy soil?
Yes, and sandy soil is actually one of the best candidates for them.
Sandy soil tends to drain quickly and struggles to hold nutrients or organic matter. Carbon-based biostimulants like CarbonizPN-G™, help increase microbial activity and improve nutrient retention. Over time, this can improve soil structure and make sandy soil more productive.
If you’ve ever felt like fertilizer “runs right through” your lawn, biostimulants can help correct that inefficiency.
Can I use biostimulants during drought?
You can, but timing and moisture matter.
Seaweed-based products like Nutri-Kelp™ (1-1-4), are especially helpful during stress because they improve drought tolerance. However, applying anything during a severe drought without irrigation isn’t ideal. If the soil is bone dry, the lawn can’t absorb much of anything.
The best approach is to apply early in the morning or in the evening, then follow with light irrigation. Biostimulants are excellent tools for helping lawns survive summer stress — but water is still the foundation.
Do biostimulants increase mowing frequency?
No — and that’s one of the benefits.
Unlike heavy nitrogen fertilization, which can force excessive top growth, most biostimulants focus on root health, density, and stress tolerance. You’ll often see thicker turf and better color without dramatically increasing how often you need to mow.
It’s improved health, not runaway growth.
Are biostimulants worth it for new lawns?
Absolutely.
New lawns need strong root establishment more than anything else. Biostimulants — especially seaweed extracts and carbon-based soil enhancers — can reduce transplant shock and encourage deeper rooting. That helps new sod anchor faster and seeded lawns establish more evenly.
If you’re investing in a new lawn, adding biostimulants to your program is one of the smartest ways to protect that investment.
Feed the Soil. Fuel the Roots. Flex the Lawn.
Biostimulants aren’t magic bottles. They’re smarter lawn care. They improve efficiency, resilience, and long-term health. And when layered correctly, they create the kind of thick, dark, stress-resistant turf you usually only see on golf courses.
So if you’re ready to stop forcing growth and start building strength, this is your blueprint.
Ready to stop guessing and start building a lawn that actually performs? Shop our full lineup of lawn biostimulants and lawn fertilizers to strengthen your roots, boost soil biology, and lock in that deep, consistent green all season long. Check out our YouTube channel for real-world lawn care tips straight from the field.
Ron Henry
Ron Henry is the founder of Golf Course Lawn, which is dedicated to helping homeowners achieve golf course-quality lawns. He holds a certificate in Sports Turfgrass Management from the University of Georgia. With expert knowledge in turf care, fertilization, and weed control, he shares practical tips and product recommendations to create lush, healthy lawns.