Skip to content
  • Home
  • Shop
  • Register Kit/Sign In
  • Lawn
    • DIY Lawncare
    • Professional Landscaping
    • Grass Seed
  • Garden
    • DIY Gardening
    • Professional Garden
  • How It Works
    • How It Works
    • Technology
  • Tips & Guides
  • Contact Us
Login
  • Facebook
  • Instagram
  • YouTube
Search
MySoil
  • HomeHome
  • ShopShop
  • Register Kit/Sign InRegister Kit/Sign In
  • LawnLawn
    • DIY Lawncare

    • Professional Landscaping

    • Grass Seed

  • GardenGarden
    • DIY Gardening

    • Professional Garden

  • How It WorksHow It Works
    • How It Works

    • Technology

  • Tips & GuidesTips & Guides
  • Contact UsContact Us
Search Login Cart 0
Cart

Your cart is currently empty.

    Order special instructions
    Estimate shipping rates
    Taxes and shipping calculated at checkout
    Subtotal
    $0.00 USD
    Search

    We use cookies

    This site uses cookies for better user experience and analytics.

    Home Shop 0 Cart
    Cart
    Back to Products
    16-0-0 Double Dark  6% Iron - Bio-Nite - Granular Lawn Fertilizer
    16-0-0 Double Dark  6% Iron - Bio-Nite - Granular Lawn Fertilizer
    16-0-0 Double Dark  6% Iron - Bio-Nite - Granular Lawn Fertilizer

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

    $39.99
    Size
    Size: 18 lbs small bag (covers 6000 sq ft)

    At MySoil® we do not produce or manufacture fertilizer products, but rather connect DIY’ers to vetted products developed by vendors specifically for the DIY market. 

    16-0-0 Double Dark blend will do just what the name implies, make your lawn double dark green, It's really that simple. The 16-0-0 Double Dark contains no phosphorus or potassium, but 25% Slow-release nitrogen and a nice 6% Iron with other micronutrients. Use when your soil test just recommends nitrogen or when you want to give your lawn a little extra color!  This fertilizer is a "hybrid", containing synthetic nutrient components as well as a natural organic base component called Bio-Nite. The Bio-Nite component feeds soil microbes and assists in building soil health. Formulated specifically for DIYers.

    • One 45 lb bag covers up to15,000 sq ft
      • Low:   3.0 lbs/1000 sq ft covers 15,000 sq ft
      • Med:  4.0 lbs/1000 sq ft covers 11,250 sq ft
      • High:  5.0 lbs/1000 sq ft covers 9,000 sq ft
    • Analysis is 16-0-0 : N-P-K
    • Contains 6% Iron + Bio-Nite™
    • Contains micronutrients: magnesium, boron, copper, manganese, molybdenum, and zinc
    • Great for greening up the lawn without too much growth or when recommended by a soil test

     

    Product Description:
    Double Dark contains 6% iron. There are very few granular fertilizers available that have this much iron in them. Iron is the key to that dark blue-green color, but Double Dark also contains 16% nitrogen because the iron won't work if the lawn isn't actively growing.

    The nitrogen in 16-0-0 Double Dark isn't over the top, it's just respectable at 16% and, 25% of that N is slow-release. You will get some green from the Nitrogen, but it's not going to cause too much top growth. The nitrogen is really just there to stimulate intake of the Iron and other soil nutrients.

     

    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 added to every bag of 16-0-0 Double Dark. Bio-Nite is the same thing as Milorganite, but comes out of South Florida instead of Milwaukee. The included Bio-Nite is feeding microbes in the soil every time you apply!

     

    Application Information:

    You can apply 16-0-0 Double Dark when your soil test recommends or when you just need a little more color and growth. 16-0-0 Double Dark 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 up to 15,000 square feet

    Application  Details

    Apply at 3-5 lbs per 1,000 square feet of lawn area


    Apply every 4-6 weeks


    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:

    • Label: 16-0-0 Double Dark PDF Label
    • Package Includes: 1 - 45 lb. bag
    • Storage: Store in dry conditions away from moisture. Can be stored for up to 2 years.
    Shipping costs

    Included for most states within the U.S.


    NO P.O. Boxes


    $9.95 for CA, WA, ID, and OR

    State Restrictions

    Alaska (AK), and Hawaii (HI)

    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

     

    Share:

    • Share on Facebook
    • Share on X
    • Pin on Pinterest
    • Share by Email
    Share
    Share
    • Facebook Share on Facebook
    • X (Twitter) Share on X
    • Pinterest Pin on Pinterest
    • E-mail Share by Email
    Need help?
    Menu
    • Affiliate Program
    • Contact Us
    • Register / Sign In
    • Shop
    • SoiLab
    • Tips & Guides
    • Terms Of Service
    • Refund Policy
    • Shipping Policy

    Tel: (855) 697-6451

    Contact Us

    Sign up for discounts and special perks!

    • Facebook
    • Instagram
    • YouTube
    © 2025 MySoil. 
    • American Express
    • Apple Pay
    • Discover
    • Google Pay
    • Mastercard
    • Shop Pay
    • Visa
    • Choosing a selection results in a full page refresh.
    • Opens in a new window.