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LAWN LIFE

DARK MATTER™ 21-0-0 Ammonium Sulfate (Small Prill)

DARK MATTER™ 21-0-0 Ammonium Sulfate (Small Prill)

Regular price $54.99 USD
Regular price Sale price $54.99 USD
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DARK MATTER™ 21-0-0 Ammonium Sulfate

⚠️ Formulation Update: Dark Matter AMS is now 21-0-0 (no iron). We removed granular iron sucrate after extensive research showed it provides little to no benefit in turf. This upgrade gives you more nitrogen and sulfur per bag, can be dissolved for liquid use, and still features the ultra-small prill size—all while remaining the cheapest ammonium sulfate online.

Premium Turf & Landscape Fertilizer – Small Prill, Fast-Acting Formula

COVERS UP TO 13,000 SQ FT

The Ultimate Fertilizer for a Deep, Rich Green Lawn

DARK MATTER™ 21-0-0 is not your average ammonium sulfate. This premium fertilizer is designed to deliver fast results, providing an intense green-up and strong, healthy turf growth. 

✔ Ultra-Fine Prill Size – Ensures better coverage and more even nutrient distribution
✔ 24% Sulfur – Improves soil health and nutrient absorption
✔ No Fillers – Just pure nutrients your lawn needs for maximum performance

Note: Product photo is not an actual photo. We have used oversized bags on this first run to keep prices as cheap as possible. So the bag will come oversized.

Application Instructions

  • Rate: 3-4 lbs per 1,000 sq. ft.
  • Frequency: Apply every 3-4 weeks or as needed based
  • Watering: Water immediately after application for best results
  • Avoid Application: If heavy rain is expected within 24 hours

Spreader Settings

For best results, apply using a calibrated spreader at the recommended settings:

  • Scotts Broadcast (Turf Builder EdgeGuard DLX, Elite, or Mini): Setting 5-6
  • Lesco Rotary (80 lb. or 100 lb.): Setting 13-14
  • Earthway Rotary (2050, 2600A, 2750, 3100, etc.): Setting 13-14
  • Spyker Rotary (P20-5010, P40-5020, P70-12010, etc.): Setting 3.5-4.0
  • Scotts Drop (AccuGreen 1000, 2000, 3000): Setting 7-8

Note: These settings are for states where this product is permitted for lawn use. Follow all local and state regulations regarding fertilizer application.

Warnings & Precautions

⚠ May cause skin and eye irritation. Avoid direct contact and inhalation of dust. Wear protective gloves, eye protection, and a dust mask when handling.
⚠ Keep out of reach of children and pets.
⚠ Contains iron – may stain concrete, driveways, and sidewalks. Sweep any spills immediately.

Storage & Disposal

  • Store in a cool, dry place and keep the bag sealed when not in use.
  • Dispose of empty bags in accordance with local regulations.

State Restrictions

❌ Not labeled for lawn use in: Florida, New Jersey, Maryland, Vermont, and New Hampshire. However, this product is approved for agricultural, ornamental, garden, and non-lawn landscape use in these states where permitted by local regulations. Always check local application guidelines before use.

🔥 Get the deepest green your lawn has ever had – grab yours now!

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  • 5 stars: 20 (95%)
  • 4 stars: 0 (0%)
  • 3 stars: 0 (0%)
  • 2 stars: 0 (0%)
  • 1 star: 1 (5%)
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Michael Godlewski

My go to method of using Dark Matter is, fill a 5 gal bucket with hot watter, add 4 8oz cups of DM and 3 8oz cups of Neighbors Envy, stir and fill my 40:1 spray bottles, apply in mid afternoonand ket sit over night.

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Brian

Quality products, always arrives on time. Love this company.

J
Joseph

Good product will order again

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Wes

The product works great. Added a ton of color to my newly seeded kbg/pr lawn after the first couple cuts I threw this down and bam a couple days later it darkened up and thickened up beautifully. The only thing I had to change was a lower setting for my crappy Scott’s broadcast spreader. The first 2 passes it was dumping out. But really no complaints

M
Mark Tutt

It works as intended

R
Randall

Gets my lawn that dark green shade even better than applying iron foliar products. Been using it all summer but especially for the Fall Nitrogen Blitz effect.

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Blaine Thorington

Absolutely the best fertilizer I have ever used...period! I use it in conjunction with Neighbors Envy. My lawn is so thick and dark green!! I mow religiously every 4 days, and my blade is up one notch higher than I previously had it. All of my neighbors constantly are asking how I do it.

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Thomas Mclellan

Did not green up at all

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Charles Slomkowski

Just about to use it in a few days. I will update once I put it down

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MIKE MARIN

Very pleased as it’s only been one week since I put it down. I will get a better look in another week. I will continue to be a customer, thank you.
-Mike

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Thomas Bardy

Just over seeded with tall turf type fescue over Labor Day weekend. Baby grass seed just started sprouting so I’m waiting another week before applying ammonium sulfate. It worked very well earlier in the year when I rotated it with Neighbors Envy. I’ve been very happy with all of the Lawn Life products I’ve purchased

I
Isaac

This stuff works really really well! Doesnt burn the lawn either. This is my fourth bag

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paul gillenberg

I love it because it works. I’m only concerned about front lawn. I normally apply twice that is recommended but after a week and a few waterings my lawn is emerald green. I live in central Texas and I have the greenest grass in the sub-division, not kidding. There are a lot of companies out here that sell lawn spraying services to homeowners, and my grass is at least 10 shades darker and my cost is insignificant to what my neighbor’s are using that service. Thanks Jesse!

C
Chad Deal

Small prill size is great for getting complete coverage without the getting those nitrogen spots in the lawn.

D
Derek

Phenomenal

A
Andrew

Fantastuc product for a green up. Just be careful that your sorrader isnt set to open when you first put it in like i did lol. Youll get some burn marks, compeltely on me though. Works fantastic ehen applied correctly

A
Andrew

Great product for greening up your yard. The staff is amazing and I recommend them to everyone who asks about how i get my lawn so green

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ALONZO MOSS

Good stuff

B
Brian

I like the small prill size. Spread evenly and has my kbg poppin!

E
Emmanuel Avgoustakis

The best!

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Willis Woodruff

Product works great! Turn your Lawn dark green..