Yard Mastery 24-0-6 Fertilizer Flagship SunnilandBag.

Yard Mastery Fertilizer & Lawn Care Products

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Written By: Mark Marino

a Massachusetts Core Applicator License holder and owner/operator of Lawn Phix,

Updated on

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Yard Mastery Lawn Care Products 

The biggest and brightest new edition this year is now available for purchase at Yard Mastery. 

Featuring their own line of fertilizers that are excellent choices for all grasses across the country. These can be used and substituted for many of the fertilizers in my free cool season lawn care guide

All bags go down at 3lbs/1000, cover 15,000 sq ft, and have the same spreader settings. These were formulated for DIY lawn care nuts, so enjoy!

Yard Mastery Fertilizers (2021)

Yard Mastery 24-0-6 Fertilizer Flagship SunnilandBag.

24-0-6 Flagship (with 3% iron) and Bio-Nite

If you’re following the Lawn Phix lawn care plan, this no phos fertilizer can be used for your May application.

This 24-0-6 Flagship fertilizer contains macronutrients nitrogen and potassium to stimulate and support healthy lawn growth and dark green color. 25% slow release nitrogen ensures a longer lasting result. Also in the bag is 3% iron to push the green darker into the blue color range along with a smattering of micronutrients required for healthy turf. Flagship is also spiked with Bio-Nite™ to stimulate microbial activity and healthy soil. The smell of success extends the color even longer, and tells you it’s working.

Download the 24-0-6 Flagship Granular Lawn Fertilizer Label 

Yard Mastery 16-0-0 Double Dark Granular Lawn Fertilizer

16-0-0 Double Dark (with 6% iron) and Bio-Nite

If you’re following the Lawn Phix lawn care plan, this no phos fertilizer can be used for your June application.

Double Dark 16-0-0 has one basic purpose and that is to help you dominate your neighbors with deeper, darker blue-green turfgrass. This is delivered with 16% nitrogen and 6% iron. The iron brings the dark blue-green and the nitrogen stimulates intake of that iron along with bringing more green color. This is an excellent summer fertilizer for all grass types. Double Dark is also spiked with Bio-Nite™ to get the microbes moving in the soil. The smell of success let’s you know it’s working

Download the Double Dark 16-0-0 Label

17-7-6 Freedom Fertilizer

Yard Mastery Freedom Fertilizer 17-7-6

Allyn Hayne, aka The Lawn Care Nut, just launched a new granular fertilizer on Yard Mastery called Freedom Fertilizer 17-7-6.

The 45 pound bag of Freedom Fertilizer from Yard Mastery covers 15,000 sq. ft. At this rate, 3 lbs. per 1,000 sq. ft. you will deliver 0.51 lbs. of Nitrogen per 1,000 sq. ft.

Yard Mastery Freedom Fertilizer Specs

  • 17% Nitrogen in the form of 13.4% Water Soluble Nitrogen and 3.6% Ammoniacal Nitrogen
    • 25% slow release per the label
  • 7% Phosphorus
  • 6% Potassium
  • Chelated Iron

Apply on Memorial Day, Independence Day (4th of July), Veterans Day, or any time of the year.

This is in limited stock so order Yard Mastery Freedom 17-7-6 fertilizer now!

7-0-20 (no) Stress Blend (with Bio-Nite)

Yard Mastery 7-0-20 Stress Blend Granular Lawn Fertilizer

If you’re following the Lawn Phix lawn care plan, this no phos fertilizer can be used for your July or August application.

Yard Mastery™ Stress Blend 7-0-20 is ideal for stressed lawns due to extreme heat, insects, disease and drought. Yard Mastery Stress Blend is the key to quick recovery. With 100% slow release nitrogen coupled with 20% potassium which help lawns recover. Stress Blend also contains micronutrients iron, zinc, magnesium, boron and manganese to further support turf in stress. It’s the ultimate fertilizer for high heat times to keep your struggling turf green and healthy. As with all Yard Mastery fertilizers, Stress Blend is spiked with Bio-Nite™ to feed microbes and encourage healthy soil.

Download the 7-0-20 Stress Blend Granular Lawn Fertilizer Label

Yard Mastery 12-12-12 Starter Fertilizer

12-12-12 Starter Fertilizer (with 3% iron) and Bio-Nite

If you’re following the Lawn Phix lawn care plan, this no phos fertilizer can be used for your September overseeding application.

Yard Mastery™ Starter Fertilizer 12-12-12 is the perfect blend of macros and micros for use anytime you want to give your lawn a hearty, balanced application. Premium nitrogen in the form of ammonium sulfate is known for being one of the more efficient plant sources bringing a striking blue-green color to all grass types. Phosphorus is also there in equal proportion to push healthy roots supported by sulfate of potash, also a more premium source of potash with a lower salt index. “Starter fertilizer fixes everything” is true, especially with our triple 12 because it also comes with 3% iron and a smattering of additional micronutrients lawns need. It’s also spiked with Bio-Nite™ our premium natural additive that stimulates microbial activity and healthy soil overall. Smells like success which tells you it’s working!

Download the 12-12-12 Starter Fertilizer Granular Lawn Fertilizer Label

Yard Mastery FAQs

What is Bio-Nite?

Bio-Nite is a bio-solid filler that Yard Mastery & Sunniland adds to every fertilizer blend. Bio-Nite is the same thing as Milorganite but instead of being sourced in Milwaukee, they get it from South Florida.

What is the best Carbon X alternative (CX DIY Fertilizer)?

Yard Mastery Flagship 24-0-6 is an alternative, though not exact. The NPK analysis on Carbon X is 24-0-4 and the Flagship is 24-0-6. Carbon X has 2% Iron and Flagship has 3%.

The major differences would be in the missing Sulfur (14%), Carbon (7%) in Carbon X and its Carbon Release Root Promoting (CRRP) Technology (biochar). But Yard Mastery does include Bio-Nite, which is a South Florida-based biosolid (similar to Milorganite).

Carbon Phix from Kelp4Less has much more similar percentages to Carbon X (CX DIY).

Who owns Yard Mastery?

According to their website, “Allyn Hane (The Lawn Care Nut) started Yard Mastery, along with his business partner, Josh Whitford, in early 2019.”

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Author's Note: this piece has been updated for accuracy since its first publication on
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Author: Mark Marino
My name is Mark Marino, and I am the founder, owner, and operator of Lawn Phix. With a passion for lawn care and turf nutrition for over a decade, I've dedicated countless hours to correcting soil and perfecting lawns. Today, my expertise, backed by formal courses at UMass Extension Pesticide Education, allows me to offer top-tier lawn care services and advice. I am a fully licensed and insured lawn care applicator in Massachusetts, specializing in comprehensive turf nutrition, weed control, and lawn pest control. My license number is AL-0053865. Contact me at [email protected] or +1 (508) 500-8402.

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