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 30 - Aug 4

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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]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 883053743

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4.1 ★★★★★
Based on 10 reviews
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Product Reviews
T
Verified Purchase
tim zaharson
Lake Worth, US
★★★★★ 5
i would recommend these shoes
Size: 11, Color: Black White 05
great shoes for the price. very comfortable...
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 14, 2026
A
Verified Purchase
Albert Alvarado
San Leandro, US
★★★★★ 5
Great Fit, Lightweight, and Totally Quiet
Size: 11, Color: New Black05
Great fit and very comfortable once you pick the right size. Lightweight, breathable, and completely silent on hard floors. No squeaks or “suction” sounds like some reviews claimed. Normal packaging, normal opening, no issues at all. Excellent value for the price.
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Reviewed in the United States on May 18, 2026
V
Verified Purchase
Vince Salvino
Boise, US
★★★★★ 5
Most comfortable shoes I've ever worn
Size: 11, Color: New Black05
First off, I was not expecting much buying a no-name shoe online, especially for the price. Boy was I in for a surprise... I've owned these for almost a full year, and can confidently say these are the most comfortable shoes I've ever worn. I normally wear a size 11 and these fit me perfectly. Prior to this the most comfortable shoes I had were some Cole Haans with the Nike air technology. These shoes are so lightweight, so comfortable, I can wear them all day long without feeling a thing. Whenever I (rarely) need to wear a different pair of shoes, I am immediately reminded of how much I used to hate wearing shoes and couldn't wait to take them off. Based on the price, I expected them to wear down quickly. However they are still going strong. Running, hiking, long walks, biking, worn to office / casual events. These shoes have been soaked in mud multiple times, but clean up easily by just throwing them in the washing machine and then the dryer. The soles and the insoles have both worn down a bit over the past year; at this rate I expect to get 1.5 to 2 years out of them before needing to be replaced. So far I must have put at least a thousand miles on these shoes based on how much I wear them. They look good too. I have the all-black pair, and they look decent with jeans and a button up shirt for a night out, but also look natural in an athletic setting with shorts and no socks. Very versatile and subtle. Now for the cons, which are minor. The pattern on the bottom of the sole is prone to some squeaking/suction sounds at first. However after about a month some of the ridges wore down just enough that it was no longer a problem. Second: they are not as breathable as I would have liked. For example, when running or biking, you don't feel any air on your feet. Wearing them out in the sun on a hot summer day, your feet will get a bit stuffy. In fact the fabric is woven tight enough that I wear them in the winter and in the rain, and don't get too cold or wet. So I do wish they made a more breathable version for summer time use. All that being said, these are still the best pair of shoes I've ever had. Ultra light weight, comfortable, and can be worn all day long without feeling any fatigue whatsoever. --- UPDATE: It's been 1 year and 9 months, and the soles on these shoes are fully worn out and ready for replacement. Considering I've put between 1,000-2,000 miles of walking in these, that's pretty good. If anyone from Feethit is reading this, here are my top suggestions to perfect this shoe: 1) Easy fix - change the tread pattern. The current pattern causes suction cup effect on hard floors until it starts to wear down. Simply add some gaps in the circle pattern in the tread and it will remedy that issue. 2) Most importantly, put a thin piece of durable rubber on the bottom of the sole. The sole does wear down after some time and lose traction, especially on smooth wet floors (e.g. in the rain, in a kitchen, etc.). A thin piece of durable rubber would add more traction and also extend the life of the cushion-like sole (which is fantastic, don't change it!). This would easily be worth an extra $5-$10 in the price.
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Reviewed in the United States on August 4, 2023
T
Verified Purchase
T. Archer
Los Angeles, US
★★★★★ 4
Nice shoes, despite the squeak and inconsistent sizing
Size: 12, Color: Black White 05
Excellent shoes at this price point. Quite comfortable. They do tend to have a nasty squeak on tile floors, sort of like a suction cup being engaged and disengaged. I bought the navy blue and went back and bought the black. I have to say that the size varied greatly. With the second pair, I have to be sure to wear thin socks and even then, I struggle to get them on, despite having an extremely narrow foot. I'm not sure that a person with an average width foot could wear them. Buyer beware. You may need to go up a size.
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Reviewed in the United States on February 13, 2026
B
Verified Purchase
Bob AIM
Carnegie, US
★★★★★ 5
My second pair and what they look like after 2 years
Size: 10.5, Color: New Black05, Size: 10.5, Color: New Black05
I wanted to write a review on these shoes. This is my second purchase. I bought the first pair 2 years ago and the bottoms started wearing out, after all it was 2 years. I read reviews saying that they did not hold up well. My pictures show before and after. The reason I purchased again is because I am impressed with the quality and comfort for the money.
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Reviewed in the United States on May 9, 2026

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