The Classic 18 - 3 - 6 with 50% SRN

5 out of 5 stars 3 Reviews | 7 Q&A

The Classic 18 - 3 - 6 with 50% SRN

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Average Rating

5 out of 5 stars Rating: 5

3 Reviews | 7 Q&A

Product Overview

The Classic 18-3-6 with 50% SRN is a professional liquid fertilizer for golf course tees and greens. Made from the highest quality N-P-K raw materials and micronutrients, Classic 18-3-6 provides golf course professionals with outstanding results and pin-point control. It contains 50% Smart Nitrogen a proprietary slow-release nitrogen source. Smart Nitrogenis high efficiency and labor-saving potential make it a golf course favorite.

Safe and easy to apply through traditional spray applicators or through fertigation, The Classic provides golf course superintendents with a perfect balance of quick-release nitrogen for fast green-up and slow release nitrogen for continuous, steady feeding without flush growth. Its unique liquid formula provides dual efficiency from foliar and root feeding, and its chelated micronutrients are immediately available for improved turf health.

The Classic has an exceptionally low salt index, and contains no harmful chlorides, hydroxides, or high sulfur products. Plus, the highly complex Smart Nitrogen polymers contain carbon, which improves soils and feeds beneficial microbes. The Classic 18-3-6  will protect the turf, soil, and the environment.

Features and Specs

Active Ingredient Nitrogen (N) - 18% Soluble Potash (P2O5) - 3% Soluble Potash (K2O) - 6%
For use in Golf Course Tees and Greens (Cool & Warm-Season Grasses)
Application * See Label for complete application instructions
Pet safe Yes, if used as directed on Label
Formulation Professional Product
Shelf Life 2 Years
Shipping Weight 27.98 lbs
Manufacturer Growth Products (Mfg. Number: FTS20120)


Growth Products Classic Program For Greens recommends using 18-3-6 on a 10 to 14-day interval, along with Micrel Total or X-Xtra Iron, plus Essential Plus and Hydro-Max for a complete greens maintenance program. 18-3-6 can also be combined with other Growth Products to meet the requirements and the turfs unique needs.

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  • 5 of 5 Stars

    Great product

    By John on 07/24/2020

    My bentgrass green was struggling . I was using an organic granular fertilizer prior to aerifying my green and the holes were not growing together. I switched to this foliar fertilizer and within 10 days I saw major improvement. Great product, easy to apply. (I used a backpack sprayer)

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    3 of 4 people found this review helpful

  • 5 of 5 Stars

    Great Product and Value

    By Quinn on 01/24/2021

    I used this product all of past year on my bentgrass putting green and the perennial ryegrass collars. I saw very consistent results throughout the season applying every 7-10 days. 50% slow release seems to be a good mix when spoon feeding. I had no significant flushes of growth and clippings were consistent. I still did supplemental fertilizing on top but this was my main N source. PLEASE get a soil test done and have someone with knowledge read it for you. There is no one size fits all fertilizer program for putting greens. Basic guidelines can point you in the right direction, but understanding your soil is critical!

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    3 of 4 people found this review helpful

  • 5 of 5 Stars

    Best in my class

    By Dallas on 04/02/2021

    I’m a home doer that loves working in the yard and especially my lawn ! I take pride in my grass because I like being the neighbor that everyone points at or asked me who does my lawn and I say ME !! But all the products that I’ve Used many years! By far this has turned my lawn in to a golf course! I basically spoon feed my lawn every week between Marc and maybe to June and then I’m done for the summer! I will and would definitely recommend this product

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Questions & Answers

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What is the coverage area for a 2.5 gallon jug of The Classic 18-3-6?

Generally speaking, the 2.5 gallon container of The Classic 18 - 3 - 6 with 50% SRN will treat about 16,000 - 45,000 sq ft depending on what you are treating (ie Greens, Fairways, Sod, etc).  

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15 of 22 people found this answer helpful

Can I apply The Classic 18 - 3 - 6 with 50% SRN using a hose end sprayer?

The Classic 18 - 3 - 6 with 50% SRN would not be recommended to apply in a hose end as the rate is not set per gallon but is per area depending on the amount of nitrogen you need to apply.  Please refer to the product label for complete instructions

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Is Classic 18 - 3 - 6 with 50% SRN natural and does it work for Kentucky Blue Grass?

Is this an all-natural product? I also don't see directions for how long to keep animals off of the lawn after application, or if animals can be out while it's being applied I also did not see that KBG was listed, but it says cool-season grasses. Can you confirm if it is safe for KGB?


The Classic 18 - 3 - 6 with 50% SRN is safe on Kentucky Blue Grass and canbe used if the nutrients it provides are what is needed in your lawn.  As long as you keep pets/children out of the area while you treat and until the product has had time to completely dry or settle it is safe for pets and people to return and resume normal activity typically after 4-6 hours.  

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Is a surfactant needed for The Classic 18 - 3 - 6 with 50% SRN?

The Classic 18 - 3 - 6 with 50% SRN does need a surfactant added. The label states to add one once it has been mixed with water. 

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Is The Classic 18 - 3 - 6 with 50% SRN a concentrate that you mix with water?

Yes, this is a concentrated fertilizer. The mix rate of Classic 18-3-6 with 50% SRN will vary depending on where you are treating. Please see the label for complete application instructions.

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The Classic 18 - 3 - 6 with 50% SRN 5 out of 5 stars Rating: 5 (3 Reviews / 7 Q&A)

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