Professional-grade lawn fertilizer
The lawn your neighbors notice. Noticeably greener.
Most lawn fertilizers push growth. Dark Venom builds color — high-iron, professional-grade liquid formula designed to deliver the deep green your lawn is actually capable of.
Build Your Lawn Program
Why your lawn isn't as green as it should be
A dull lawn isn't a water problem. It's a nutrition problem.
You can water all you want. If your lawn lacks iron, it'll never hit that deep, rich green. Most lawn fertilizers are nitrogen-heavy — they push growth but not color. Dark Venom is different. High iron, precise nutrition, and Nutrx™ technology designed to maximize how much of every application your lawn actually uses. Your booster completes the program by supporting the micronutrient layer that keeps your turf strong all season..
THE COMPLETE PROGRAM
The complete lawn program — turf formula + booster
Your hero formula is engineered toward a specific outcome — a deep, rich green lawn that holds color all season. Your booster completes the program by supporting soil health and filling the nutritional gaps your hero formula can't address on its own. Together they work in a way neither can alone.
One quart covers up to 10,000 sq ft. At the standard rate, most residential lawns are covered in a single pass.
![Lawn Fertilizer with Iron – Dark Venom [3-0-5 + 1.5% Iron]](http://gardeniq.com/cdn/shop/files/Dark_Venom_Spray_Quart.png?v=1776884345&width=280)
Hero Formula — Turf Formula
Dark Venom [3-0-5 + 1.5% Iron]
High-iron liquid lawn fertilizer that builds deep green color without excessive mow surge. Connects to your standard garden hose. Covers up to 10,000 sq ft.
Booster — Feed the Soil
Doonbeg [3-0-2]
North Atlantic kelp + molasses. Feeds beneficial soil microbes and fuels steady above-ground growth. For gardeners who think long-term.
From $30 — Pint
Booster — Fill the Gaps
Octane Boost [4-0-2]
7 chelated micronutrients powered by Nutrx™. Addresses the hidden deficiencies that hold your results back. Faster, more visible impact.
From $30 — Pint
Choose Your Booster Size
Your Program Price
—
Save $10 · Free shipping included
$10 off applied automatically · Free shipping when you bundle
Not seeing results? We'll make it right.
Value per bottle
One bottle. Your entire lawn.
Dark Venom connects directly to your garden hose — no measuring, no mixing. A single Spray Quart covers up to 10,000 square feet per application. That's most residential lawns covered in one pass.
Spray Quart
10,000
sq ft per application — covers most residential lawns in a single pass
Refill Quart
10,000
sq ft — refill your existing sprayer and keep going without buying a new bottle
Half Gallon
10,000+
sq ft with multiple applications — feed more frequently or cover a larger property
Coverage based on standard hose-end application rate. Avoid spraying concrete or stonework — contains iron.
Our proprietary technology
Why GardenIQ works: Nutrx™ technology
Every GardenIQ formula is powered by Nutrx™ — a proprietary blend of carbon complexes, humic and fulvic acids, protein complexes, and amino acids developed through decades of professional agronomic research. Trusted by golf courses and commercial turf managers. Now available for your lawn.
Learn the science behind Nutrx™ →
Simple application
How to use your GardenIQ lawn program
Step 1
Connect
Attach Dark Venom directly to your garden hose. No measuring or mixing required.
Step 2
Spray
Apply evenly across your lawn. One bottle covers up to 10,000 sq ft. Avoid spraying concrete or stone — contains iron.
Step 3
Watch it green up
Deep green color typically visible within days. Apply every 2–4 weeks during the growing season.
Real results
What our customers are saying
My lawn was very healthy after spraying it and the hose sprayer bottle made it really easy to apply.
My lawn has never looked so green. Refilled the bottle with BlossoMax using a funnel — super convenient.
My lawn seemed greener than last year and more lush as well.
Ready to get started?
Golf course green. Without the grounds crew.
Professional-grade iron formula. Easy hose-end application. Deep green color.
Build Your Lawn ProgramBlended and bottled in-house in Chicago, IL — not outsourced.