Product Code


Peters Excel 15-5-15 Cal-Mag Special

  • Advantages
  • Directions
  • Recommended Rates
  • Download Product Sheet
  • versatile, all-purpose formulation for constant, balanced nutrition
  • effective for water types 1 and 2
  • 100% water soluble 
  • pure formulation—no ballast substances
  • elevated levels of chelated trace elements ensure robust growth and rich color
  • contains NPK, magnesium and micronutrients
  • developed for peat-based cultures (pot plants, bedding plants and container nursery stock)
  • exclusive M-77 chelating formula for fast, efficient nutrient uptake
  • consult rate tables printed on bag labels
  • verify product analysis, longevity and rate for plants in your production system (for assistance, contact your regional ICL-SF Territory Manager or call the ICL Lab at 877-467-8522)
  • 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)
  • store in a clean, cool, dry place
Recommended Rates


Weight (In Ounces) Of Product Needed To Mix One U.S. Gallon Of Concentrate

Target Fertilizer
Concentration (ppm N)
After Dilution

Injector Ratios

EC mmhos/cm of
Target Feed Rate After Dilution

1:15 1:100 1:200
50 0.7 4.5 9.0 0.35
100 1.4 9.4 18.0 0.69
200 2.7 18.0 36.0 1.38
300 4.1 27.0 *** 2.07


Gallons Of Water Required To Dissolve One 25 Lb Bag Of Fertilizer

Target Fertilizer Concentration
(ppm N) After Dilution

Injector Ratios
1:100 1:200
50 88.9 44.4
100 44.4 22.2
200 22.2 11.1
300 14.8 ***

For a complete list of target concentrations (ppm N), please refer to the Product Information Sheet.

Mixing for watering cans, spray tanks (no injectors)

Amount of Fertilizer       +       Amount of water (gallons)  =       Approximate ppm N
1 tsp. 1 194
1 tbsp. 2 291
1 cup 25 372


Specialized formulation provides a continuous supply of the calcium and magnesium not found in soft water systems. High nitrate and low phosphate levels encourage healthy, compact growth. Contains three chelated irons, including black iron—the most effective for growing ornamentals.