---
product_id: 14730146
title: "MSU Orchid Fertilizer 13-3-15 Reverse Osmosis, Rain, Tap (City) Water Formula 5 Pounds"
brand: "jim's orchid supplies"
price: "€ 160.48"
currency: EUR
in_stock: true
reviews_count: 8
category: "Jim's Orchid Supplies"
url: https://www.desertcart.hr/products/14730146-msu-orchid-fertilizer-13-3-15-reverse-osmosis-rain-tap
store_origin: HR
region: Croatia
---

# Includes Ca & Mg for vibrant growth Instantly water soluble 13-3-15 NPK precision blend MSU Orchid Fertilizer 13-3-15 Reverse Osmosis, Rain, Tap (City) Water Formula 5 Pounds

**Brand:** jim's orchid supplies
**Price:** € 160.48
**Availability:** ✅ In Stock

## Summary

> 🌸 Feed your orchids like a pro—science meets simplicity!

## Quick Answers

- **What is this?** MSU Orchid Fertilizer 13-3-15 Reverse Osmosis, Rain, Tap (City) Water Formula 5 Pounds by jim's orchid supplies
- **How much does it cost?** € 160.48 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.hr](https://www.desertcart.hr/products/14730146-msu-orchid-fertilizer-13-3-15-reverse-osmosis-rain-tap)

## Best For

- jim's orchid supplies enthusiasts

## Why This Product

- Trusted jim's orchid supplies brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Water-Ready Granules:** Instantly dissolves even in cold water for hassle-free feeding
- • **Ultra-Efficient Usage:** Just ½ to 1 teaspoon per gallon unlocks powerful growth—max results, minimal waste
- • **Humidity-Responsive Color Indicator:** Unique pellet color shifts reveal moisture levels—know your fertilizer’s freshness at a glance
- • **Urea-Free & Complete Micronutrients:** No urea, enriched with iron, manganese, zinc, copper, boron & molybdenum for balanced plant health
- • **Scientifically Engineered Nutrient Mix:** MSU-developed 13-3-15 formula with calcium & magnesium for orchid-specific vitality

## Overview

MSU Orchid Fertilizer 13-3-15 is a premium, water-soluble formula designed by Michigan State University to deliver balanced macronutrients and essential micronutrients including calcium and magnesium. Ideal for orchids and aroids, it requires minimal dosage for maximum growth impact. Its unique pellet color changes with humidity, ensuring freshness, while being urea-free for safer, healthier plants.

## Description

Guaranteed Analysis Macronutrients: 13.0% Total Nitrogen (Nitrate Nitrogen 12.5%, Ammoniacal Nitrogen 0.7%) 3% Available Phosphate Acid (P2O5) 15.9% Soluble Potash (K2O) 8.0% Calcium (Ca) 2% Magnesium (Mg) Derived from calcium nitrate, magnesium nitrate, potassium nitrate and monopotassium phosphate Micronutrients: 0.177% Iron (Fe) 0.088% Manganese (Mn) 0.044% Zinc (Zn) 0.044% Copper (Cu) 0.018% Boron (B) 0.018% Molybdenum (Mo) Derived from Iron EDTA, manganese sulfate, zinc sulfate, copper sulfate, boric acid, ammonium molybdate GreenCare started a revolution in the fertilizer industry when it introduced its blends incorporating calcium, magnesium and complete minor elements. Tinny pellets with fine powder. Color from off whitish/brown to whitish/blue/green. Instantly water soluble, even in cold water. All information comes from the manufacturer. If any the manufacturer would be solely responsible for any warranties implied or not. Granular fertilizers can start to liquefy in the bag due to contact with moisture/humidity. This will vary depending on humidity and how often the container is opened. This does not mean the fertilizer has gone bad. You can still use in liquefied state.

Review: EUREKA !!! - Very well engineered by the scientists at Michigan State University (MSU). This formula is unique in that it has calcium and magnesium and is urea free, unlike most other fertilizers. Although it was not designed for orchids, it's a wonderful choice for them. I dont think the brand matters so much as the formula. I used to have to find a good urea free product then add calcium and magnesium. This product eliminates that.
Review: Amazing Results for My Aroids - I started using the MSU Orchid Fertilizer on my aroids after hearing great things, and it did not disappoint! My plants are thriving and I have much faster growth. It’s incredibly easy to use—just mix, water, and watch the magic happen. The value from this seller is unmatched. You get so much product for the price, and since you only need a small amount, it lasts forever. I’ve tried other fertilizers, but this one is in a league of its own. Whether you’re caring for orchids or other houseplants, especially aroids, this fertilizer is a must-have. It’s my go-to for keeping my collection healthy and happy!

## Features

- MSU ORCHID Fertilizer 13-3-15 Reverse Osmosis, rain, tap (City) water formula 5 pounds. Small pellets with fine powder. Color from off whitish/brown to whitish/blue/green.
- Formulated specifically for orchids by Michigan State University (MSU)
- 1pound = 50 + teaspoons. Mix at 1/2 to 1 Teaspoon per gallon of water.
- you only need a very small amount of water to bring out the color in the bag and the presence or absence of the color will often times depend on the humidity at the time of mixing. In the end, none of this makes any difference to the plant. Bill Argo, Ph.D. Blackmore Company 10800 Blackmore Ave. Belleville, MI 48111
- Water soluble fertilizer. Must be mixed with water. One downside to MSU is it is a moisture magnet. this can effect color some. Granular fertilizers can start to liquefy in the bag due to contact with moisture/humidity. This will vary depending on humidity and how often the container is opened. This does not mean the fertilizer has gone bad. You can still use in liquefied state.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Best Sellers Rank | #211,945 in Patio, Lawn & Garden ( See Top 100 in Patio, Lawn & Garden ) #3,652 in Garden Fertilizers |
| Brand | Jim's Orchid Supplies |
| Customer Reviews | 4.6 out of 5 stars 24 Reviews |
| Item Form | Granules, Powder |
| Manufacturer | GREENCARE Fertilizers, INC |
| Number of Items | 1 |
| Unit Count | 80 Ounce |

## Product Details

- **Brand:** Jim's Orchid Supplies
- **Item Form:** Granules, Powder
- **Coverage:** Medium
- **Mixing ratio:** 1/2 to 1 Teaspoon per gallon of water
- **Specific Uses For Product:** Orchid

## Images

![MSU Orchid Fertilizer 13-3-15 Reverse Osmosis, Rain, Tap (City) Water Formula 5 Pounds - Image 1](https://m.media-amazon.com/images/I/71vjbgzlC7L.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ EUREKA !!!
*by C***N on April 2, 2025*

Very well engineered by the scientists at Michigan State University (MSU). This formula is unique in that it has calcium and magnesium and is urea free, unlike most other fertilizers. Although it was not designed for orchids, it's a wonderful choice for them. I dont think the brand matters so much as the formula. I used to have to find a good urea free product then add calcium and magnesium. This product eliminates that.

### ⭐⭐⭐⭐⭐ Amazing Results for My Aroids
*by I***I on December 26, 2024*

I started using the MSU Orchid Fertilizer on my aroids after hearing great things, and it did not disappoint! My plants are thriving and I have much faster growth. It’s incredibly easy to use—just mix, water, and watch the magic happen. The value from this seller is unmatched. You get so much product for the price, and since you only need a small amount, it lasts forever. I’ve tried other fertilizers, but this one is in a league of its own. Whether you’re caring for orchids or other houseplants, especially aroids, this fertilizer is a must-have. It’s my go-to for keeping my collection healthy and happy!

### ⭐⭐⭐⭐⭐ Great for hydroponic growing.
*by L***. on January 30, 2025*

This is a great product to use for hydroponic growing. Mix 2.5 lbs (half the bag) of dry granuals with 1 gallon of distilled water to make a 1 gallon jug of concentrated liquid grow solution. Feeding for hydroponic use is 15ml of concentrate per a gallon of water. Works great.

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*Product available on Desertcart Croatia*
*Store origin: HR*
*Last updated: 2026-03-11*