Osmocote Plus 15-9-12 8-9 Month Lo-Start Fertilizer

5 out of 5 stars 3 Reviews | 1 Q&A

Osmocote Plus 15-9-12  8-9 Month Lo-Start Fertilizer

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Average Rating

5 out of 5 stars Rating: 5

3 Reviews | 1 Q&A

Product Overview

Osmocote Plus 15-9-12 8-9 Month Lo-Start Fertilizer is a controlled release fertilizer that contains 100% resin-coated homogenous fertilizer cores containing the major nutrients (nitrogen, phosphorous, and potash) in addition to the secondary nutrients sulfur and magnesium and sulfur, as well as the minor nutrients copper, boron, iron, molybdenum, manganese, and zinc. It features a patented nutrient release technology which allows the release of nutrients at a lower rate early in the 8-9 month release period, and at a higher rate later on.  It is recommended to apply this product towards the end of the growing season, such as when planting nursery stock or perennials late in the season to be overwintered, as the lower initial release rate helps to maintain salt levels at lower levels during rooting and storage.  Ideal for use in nurseries, greenhouses, foliage production, container gardens, landscaped areas, and interiorscapes.

Features and Specs

Active Ingredient Nitrogen - 15% Phosphate - 9% Potash - 12% Magnesium - 1.3%, Sulfur - 6%, Boron - 0.02%, Copper - 0.05%, Iron - 0.46%, Manganese - 0.06%, Molybdenum - 0.02%, Zinc - 0.05%
For use in Greenhouse, Nursery and Foliage production, Container Gardens, Interiorscapes and Landscapes
Application * See label for complete application instructions
Pet safe Yes, if used as directed on label
Formulation Professional Product
Special Features Patented Nutrient Release Technology
Shipping Weight 50.77 lbs
Manufacturer ICL Specialty Fertilizers (Mfg. Number: G903246)



  • Verify product analysis, longevity and rate for plants in your production system (for assistance, contact your regional ICL-SF Territory Manager or call ICL-SF Customer Service at 800-492-8255)
  • Consult rate tables printed on bag labels and product sheets
  • For incorporation, blend into growing media to ensure uniform distribution of cores
  • Do not over-mix (doing so could damage fertilizer coating)
  • Growing media should be used within two to four weeks after incorporating fertilizer
  • For top-dress applications, spread fertilizer evenly on container surface (avoid piling fertilizer directly against plant stem)
  • Irrigate after application (irrigation frequency and volume should be adjusted during the crop production cycle according to crop type, environmental conditions and desired soluble salt levels)
  • A product trial is recommended before adopting a new fertilizer program or making full-scale changes to standard cultural practices (test several rates on representative plant types)
  • Use caution when applying to plants being over-wintered under cover (if you can't monitor soluble salts and/or adjust irrigation practices, avoid Fall and Winter applications
  • Store in a clean, cool, dry place

*See label for complete application instructions. 

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  • 5 of 5 Stars

    As advertised

    By John on 09/14/2014

    Verified Purchase

    It's a fertilizer offering up to 9 months of release period that graphs almost flat, (not loaded to the beginning or fading in the later months). No burning at application solid growth thru the product life. Minors included. Your results may vary.

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    3 of 3 people found this review helpful

  • 5 of 5 Stars

    worth every dollar

    By Randy on 05/03/2019

    regular fertilizer last 4-6 weeks this lasts 8-9 months that's almost 7 times greater response and it includes all the micro-nutrients all slow release

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    2 of 2 people found this review helpful

  • 5 of 5 Stars

    Osmocote Plus

    By Sheajames on 04/21/2020

    I really appreciate the ability to get this item shipped to me in California. It arrived well wrapped in a heavy cardboard box. It made it easy to unload off the delivery truck. I have used Osmocote in the past. I like the longer release time and the fact that it has the minors.

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    2 of 2 people found this review helpful

See all 3 customer reviews

Questions & Answers

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Is Osmocote Plus Standard 8 to 9 Months 15-9-12 Fertilizer 8 good for roses?

Osmocote Plus Standard 8 to 9 Months 15-9-12 Fertilizer is for use in greenhouse, nursery and foliage production, container gardens, interiorscapes and landscapes, though it does not list it is for use on roses.  We do have other Rose & Flower fertilizers that might better suit your needs depending on the nutrients needed.

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0 of 1 people found this answer helpful

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