SKU: 883053743

16-0-0 Double Dark 6% Iron - Bio-Nite - Granular Lawn Fertilizer

Sale price$40.49 Regular price$44.99
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Ships within 48 hours · Estimated delivery Jul 14 - Jul 19

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Description

16-0-0 Double Dark 6% Iron - Bio-Nite - Granular Lawn Fertilizer16 0 0 Double Dark blend will do just what the name implies: make your lawn double dark green. It's really that simple green and more green. One 45 lb bag covers 15,000 sq ft Analysis is 16 0 0:: N P K, plus 6% iron Contains Urea for a darker green color Great for greening up the lawn but wont flush it with too much growth Product Description: First off, let's just point out that Double Dark contains 6% iron. There are very few granular fertilizers

16-0-0 Double Dark blend will do just what the name implies: make your lawn double dark green. It's really that simple - green and more green.

  • One 45 lb bag covers 15,000 sq ft
  • Analysis is 16-0-0:: N-P-K, plus 6% iron
  • Contains Urea for a darker green color
  • Great for greening up the lawn but won’t flush it with too much growth

 

Product Description:
First off, let's just point out that Double Dark contains 6% iron. There are very few granular fertilizers available that have this much iron in them. We all know that iron is the key to that dark blue-green color, but...Double Dark also contains 16% nitrogen because one thing that so many people forget is that iron won't work if the lawn isn't actively growing.

Think about it: the lawn has to be growing in order to take in nutrients and what element stimulates growth? Answer: Nitrogen The secret to Double Dark is that the nitrogen and the iron are working together. Search around and you will hear people who say, "I was using Ironite but after a while, it just stopped working." That is because there is no nitrogen in that product to keep things growing.


The nitrogen we put in Double Dark Blend isn't over the top - it's just respectable at 16% and, one-quarter of that N is slow release. You will get some green from the N too, but it's not going to smack your lawn in the face and make it flush out a bunch of top growth. The nitrogen is really just there to stimulate intake. 

You can also apply Double Dark in between your regular fertilizer applications if you just feel like you want to sling some fert!

For Warm-season turf will benefit from sustained “spoon-feeding” monthly in summer with this product.

Cool-season turf will benefit from added color without a strong surge from too much N.

 

All-Natural Bio-Nite™ in Every Bag!
Bio-Nite is a bio-solid filler we add to every bag of Double Dark Fertilizer. Bio-Nite is the same thing as Milorganite, but instead of being sourced in Milwaukee, it comes from South Florida. We can tell you that it “smells like a whole lot of success!” The good news for you is that the smell tells you that the included Bio-Nite is feeding microbes in the soil every time you apply and they love it!

 

Application Information:
Double Dark Fertilizer Blend can be used on the following grasses:

Cool Season Lawns - Kentucky Bluegrass, Turf Type Tall Fescue (all fescues), Ryegrass.
Warm Season Lawns - Bermuda, St Augustine, Zoysia, Centipede, Bahia.

 Coverage

A 45 lb bag covers 15,000 square feet

Application  Details

Apply at 3 lbs per 1,000 square feet of lawn area


Apply every 30-45 days


Can be applied at any time during the growing season for both cool and warm-season lawns

Water-In  Instructions

Apply to a dry lawn, and water into turf within the first 48 hours with 1/4" of rainfall or irrigation


Sweep excess off sidewalks and driveways to avoid staining

 

Product Resources:

Shipping costs

Included for most states within the U.S.


NO P.O. Boxes

State Restrictions

AK, HI, CA, WA, ID, and OR

Stickers

Yes, free stickers with this item

Typical Delivery Time

4 - 7 business days

Product Type

Granular

Cancel | Return | Exchange

All sales are final, no cancellations, returns or exchanges

 

Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
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SKU: 883053743

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Linda Swanson
Phoenix, US
★★★★★ 4
Fine little tight around collar
Color: White, Size: X-Large
Little tight around collar
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Reviewed in the United States on April 20, 2026
R
Verified Purchase
Reginald Carroll
New York, US
★★★★★ 5
Great
Color: Light Blue, Size: XX-Large
Great dress shirt !!
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Reviewed in the United States on April 28, 2026
B
Bart
Phoenix, US
★★★★★ 5
Comfortable casual shorts for summer wear.
Size: Large, Color: Dark Grey
The twill chino style looks a little nicer than basic athletic shorts, and the drawstring waist keeps them easy to wear.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 27, 2026
I
IMHO
Pawtucket, US
★★★★★ 4
Slightly shiny material with a non neutral khaki color
Size: Large, Color: Khaki
I ordered these for my husband as nice looking shorts that would be casual and comfy. The Large fit his 35" waist ok, a slightly baggy around the crotch. The material is lightweight and they are decent quality for the price. We were both not a fan of the slightly shiny sheen of the material and the khaki color is not a neutral khaki, it is more peach or coral undertoned. He was wearing a garment washed coral pink tone T-shirt when he tried these on and it clashed horribly. Might have looked better with a black or dark shirt but just not an easy khaki that goes with everything unfortunately. Because of the sheen and color he probably won't wear them and we will just donate.
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Reviewed in the United States on May 20, 2026
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Bryan T
Port Orchard, US
★★★★★ 2
Order larger than they suggest.
Size: XX-Large, Color: Black
Do not listen to size suggestions. These are sized in China. Everything runs much smaller than what they are claiming. Amazons suggestions do not take this into account. They also don't feel like twill, maybe some kind of nylon woven like twill? Not sure.
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Reviewed in the United States on May 20, 2026

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