16-0-0 Double Dark  6% Iron - Bio-Nite - Granular Lawn Fertilizer
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 6 - Jul 11

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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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Justin
San Leandro, US
★★★★★ 5
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These are awesome and have become my favorite socks to have for everyday wear. I have since bought the hightop version as well and there are just as equally great. They fit almost like compression socks. Color does fade a bit after repeated washing but not enough to make a big difference in appearance. They have lasted for a long time and still going. They have lots of cushion which makes it very comfortable to wear.
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kimberly jumper
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Talla perfecta
Color: (001) Black / Black / Castlerock, Size: Large
Excelente producto
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Reviewed in the United States on April 28, 2026
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Rachel D.
Fort Morgan, US
★★★★★ 4
Good sock but thick
Color: (001) Black / Black / Castlerock, Size: Small
These Under Armour socks are high quality and definitely durable, with great cushioning and a solid fit that stays in place throughout the day. The material feels supportive and they hold up well after multiple washes without losing shape. My only minor downside is that they’re thicker than I expected. They feel more like a heavy-duty training sock, which is great for colder weather or intense workouts, but a bit bulky for everyday sneakers or warmer days. That said, the quality is excellent, and if you prefer a thicker, more cushioned sock, these are perfect. Just something to be aware of depending on how you plan to use them.
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Reviewed in the United States on May 26, 2026

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