12-12-12 Starter Fertilizer 3% Iron - Bio-Nite - Granular Lawn Fertilizer
12-12-12 Starter Fertilizer 3% Iron - Bio-Nite - Granular Lawn Fertilizer
12-12-12 Starter Fertilizer 3% Iron - Bio-Nite - Granular Lawn Fertilizer

12-12-12 Starter Fertilizer 3% Iron - Bio-Nite - Granular Lawn Fertilizer

Regular price
Regular price
Sale price
Unit price
Sold out

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. 

This 12-12-12 fertilizer is a balanced blend of Nitrogen, Phosphorus, and Potassium, and includes micronutrients. The 12-12-12 is a great fertilizer for soils that require a good balance of the “Big 3” nutrients (N-P-K).  12-12-12 is also great for new seeding and sodding projects to give new plants a balanced start.  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 to 15,000 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 12-12-12 : N-P-K
  • Contains 3% Iron + Bio-Nite™
  • Contains micronutrients: magnesium, boron, copper, manganese, molybdenum, and zinc
  • Great for seeding/sod installation or when recommended by a Soil Test

Product Description:

The 12-12-12 Starter contains 12% nitrogen, utilizing a premium nitrogen source of ammonium sulfate which brings a really nice dark-blue-green color to turf and interacts well with the other elements in the overall blend.

This blend also contains 12% phosphorus, which is plenty to push roots in an existing lawn or stimulate rooting in your seed, sod, plug, or spring project. Rounding out the macros is 12% potassium. For potassium, the 12-12-12 Starter uses a premium formulation, sulfate of potash, known to have a lower salt index. Also includes 3% Iron and a suite of other micronutrients including boron, copper, manganese, molybdenum, and zinc.


All-Natural Bio-Nite™ in Every Bag!

Bio-Nite is a bio-solid filler added to every bag of 12-12-12 Starter. 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 12-12-12 Starter Fertilizer when you seed or sod, but it’s also great for anyone just looking for “all the things”. If you have a soil test that shows that you are low on the “Big 3” macros, (Nitrogen, Phosphorus, and Potassium), this is an excellent choice. 12-12-12 Starter Fertilizer 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.


A 45 lb bag covers 9,000-15,000 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:

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)


Yes, free stickers with every order

Typical Delivery Time

4 - 7 business days

Product Type


Cancel | Return | Exchange

All sales are final, no cancellations, returns, or exchanges

Customer Reviews

Based on 1 review Write a review
Customer Reviews
5.0 Based on 2 Reviews
5 ★
4 ★
3 ★
2 ★
1 ★
Write a Review Ask a Question

Thank you for submitting a review!

Your input is very much appreciated. Share it with your friends so they can enjoy it too!

Filter Reviews:
United States United States


Difficult to find such an excellent and thought out blend. Glad I stumbled into this fertilizer

Gregory V.
United States United States

Starter fertilizer

This is the best fertilizer I have used on my lawn so far. I’m hooked on YardMastery fertilizers now.. I would be glad to advertise the products.