Peters Professional Excel Cal-Mag Special
Best professional-grade fertilizer for container plants grown in soft water.
This is the gold standard for growers battling soft water, delivering a precise calcium-magnesium boost that keeps plants compact and vibrant. You trade the simplicity of a basic all-purpose feed for a sophisticated, chelated nutrient profile that ensures your plants actually absorb what they need.
$51.11
at
Custom Hydro
Who it's for
- Commercial growers seeking an all-in-one nutrient solution
- Gardeners managing hard water or high-pH growing environments
- Professionals using automated irrigation and fertigation systems
Who should skip it
- Beginners lacking the tools to monitor electrical conductivity levels
- Botanists requiring specialized ratios for flowering or rooting stages
- Hobbyists operating on a strict, budget-conscious gardening plan
Performance breakdown
Nutrient Solubility
Dissolves completely without leaving residue in irrigation or drench systems.
Micronutrient Availability
Advanced chelation ensures iron and trace elements remain accessible to roots.
Growth Regulation
High nitrate ratio effectively prevents leggy growth in containerized plants.
Soft Water Compatibility
Specifically engineered to balance calcium and magnesium in low-mineral water.
Feeding Consistency
Formulated for reliable, continuous nutrient delivery in professional nursery settings.
Purity Standards
Clean, ballast-free composition minimizes salt buildup in peat-based growing media.
Key Specs
Fertilizer Grade
15-5-15
Total Nitrogen (N)
15%
Available Phosphate (P2O5)
5%
Soluble Potash (K2O)
15%
Calcium (Ca)
5.0%
Magnesium (Mg)
2.0%
Iron (Fe)
0.08%
Package Weight
25 lb
Nitrogen Percentage
15%
Phosphorus Percentage
5%
Know before you buy
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