---
product_id: 309818485
title: "Peters Excel 15-5-15 Cal-Mag Special w/Black Iron (3) = 3 1lb Bags"
brand: "peters"
price: "371.73 DT"
currency: TND
in_stock: true
reviews_count: 8
category: "Peters"
url: https://www.desertcart.tn/products/309818485-peters-excel-15-5-15-cal-mag-special-w-black
store_origin: TN
region: Tunisia
---

# 5% Calcium + 2% Magnesium boost 15% Nitrogen for lush growth 0.75% Black Iron for vibrant foliage Peters Excel 15-5-15 Cal-Mag Special w/Black Iron (3) = 3 1lb Bags

**Brand:** peters
**Price:** 371.73 DT
**Availability:** ✅ In Stock

## Summary

> 🌱 Elevate your garden game with the pro’s secret weapon!

## Quick Answers

- **What is this?** Peters Excel 15-5-15 Cal-Mag Special w/Black Iron (3) = 3 1lb Bags by peters
- **How much does it cost?** 371.73 DT with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.tn](https://www.desertcart.tn/products/309818485-peters-excel-15-5-15-cal-mag-special-w-black)

## Best For

- peters enthusiasts

## Why This Product

- Trusted peters brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Black Iron Boost:** Unique black iron inclusion promotes deep green, vibrant leaves.
- • **Cal-Mag Powerhouse:** Added Calcium & Magnesium strengthen cell walls and enhance resilience.
- • **Customizable Strength:** Easily adjust application rates to match seasonal plant needs.
- • **Precision-Engineered Nutrient Blend:** Balanced 15-5-15 NPK formula fuels vigorous, healthy plants.
- • **Professional Grade, Convenient Sizes:** Trusted by commercial nurseries, now in perfect 1lb, 3lb, 5lb, & 10lb packs.

## Overview

Peters Excel 15-5-15 Cal-Mag Special w/ Black Iron is a professional-grade fertilizer designed for orchids and a wide range of plants. Featuring a balanced nitrogen-phosphorus-potassium ratio with added calcium, magnesium, and black iron, it supports strong, healthy growth and vibrant blooms. Available in convenient sizes, it allows precise nutrient management tailored to seasonal needs, making it a top choice for both commercial growers and passionate home gardeners.

## Description

Peters Excel 15-5-15 Cal-Mag Special w/ black Iron is the best fertilizer for your orchids with balanced N & K, low P, added calcium and magnesium along with key micronutrients. Also great for roses, bromeliads, lilies, all potted and landscape plants. GUARANTEED ANALYSIS: Total Nitrogen (N) . . . . 15.0% 1.4% Ammoniacal Nitrogen 11.6% Nitrate Nitrogen 2.0% Urea Nitrogen Available Phosphate (P2O5) . . 5.0% Soluble Potash (K20) . . . . 15.0% Calcium (Ca) . . . . 5.0% Magnesium (Mg) . . . . 2.0% Boron (B) . . . . 0.0187% Copper (Cu) . . . . 0.0187% Iron (Fe) . . . . 0.75% Manganese (Mn) . . . . . 0.0375% Molybdenum (Mo) . . . . 0.0075% Zinc (Zn) . . . . 0.0375%

Review: Easy use, doesn’t cause leaf burns - Very good product. My plants are already responding very well to it
Review: Its fertilizer - perfect for my vandas

## Features

- Professional formular used by commercial nurseries now available in convenient sizes of 1lb., 3lb., 5lb., & 10lb.
- Similar to the “MSU Magic Fertilizer,” with added Calcium and Magnesium to help grow vigorous strong healthy plants.
- Provides the vital micronutrients necessary for healthy plant growth to produce vibrant blooms.
- Easy to adjust strength based on the seasonal needs of your plants. Application rates included on packaging.
- NEW FORMULAR with Black Iron. Re-packaged weekly to convenient sizes. Get just what you need.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B08NHVR36X |
| Best Sellers Rank | #59,195 in Patio, Lawn & Garden ( See Top 100 in Patio, Lawn & Garden ) #1,255 in Garden Fertilizers |
| Brand | Peters |
| Brand Name | Peters |
| Coverage | Medium |
| Customer Reviews | 4.7 out of 5 stars 71 Reviews |
| Item Form | Granules, Powder |
| Item Weight | 16 ounces |
| Manufacturer | Everris NA Inc |
| Mixing Ratio | 15:5:15 |
| Model Number | 15 515 |
| Number of Items | 1 |
| Number of Packs | 3 |
| Specific Uses For Product | Plant Growth |
| Target Species | orchids |
| UPC | 848264006525 |
| Unit Count | 48 Ounce |

## Product Details

- **Brand:** Peters
- **Item Form:** Granules, Powder
- **Item Weight:** 16 ounces
- **Number of Packs:** 3
- **Specific Uses For Product:** Plant Growth

## Images

![Peters Excel 15-5-15 Cal-Mag Special w/Black Iron (3) = 3 1lb Bags - Image 1](https://m.media-amazon.com/images/I/81VC+nGZyjL.jpg)

## Available Options

This product comes in different **Item Package Quantity** options.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Easy use, doesn’t cause leaf burns
*by P***S on April 27, 2026*

Very good product. My plants are already responding very well to it

### ⭐⭐⭐⭐⭐ Its fertilizer
*by C***Y on April 19, 2026*

perfect for my vandas

### ⭐⭐⭐⭐⭐ Critical for Orchids
*by I***S on November 13, 2025*

This fertilizer is rather difficult to find, but it's worth the hunt. Many of the speakers we've had come to our orchid society have recommended this fertilizer, which was first promoted by Michigan State University. The calcium and magnesium supplements appear necessary for proper orchid development. We use it one-fourth to one-half recommended strengty monthly during the growing season.

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*Product available on Desertcart Tunisia*
*Store origin: TN*
*Last updated: 2026-10-19*