• Guaranteed Analysis
Total Nitrogen (N) 0%
Available Phosphate (P205) 0%
Soluble Potash (K20) 0%
Sulfur (S) 13.3%



2-3 Months

Product Code


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Osmocote  Osmocote Blue-Max, 2-3M


  • Advantages
  • Recommended Rates
  • Directions
  • Download Product Sheet
  • specially formulated to enhance color in blue hydrangeas
  • 100% resin-coated cores prevent overdoses and minimize root burn
  • safe and consistent release eliminates need to reapply
  • phytotoxicity risk is significantly lower than drenches
Recommended Rates


  Low High
Pounds per cubic yard 8.0 12.0
Kilograms per cubic meter 4.7 7.1
Grams per liter 4.7 7.1
  • 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

Blue-Max with polymer-coated E-Max Release Technology safely delivers aluminum sulfate and essential micronutrients to produce brilliant blue hydrangeas.