High Magnesium Fertilizer | Plus Micro Nutrients
STEP Hi-Mag Micronutrients Fertilizer is a professional granular fertilizer supplement formulated to enhance ornamental plant nutrition with magnesium and essential trace elements. Designed for container-grown and landscape ornamentals, this 0-0-0 micronutrient package provides magnesium, sulfur, iron, manganese, zinc, and copper without adding primary N-P-K nutrients.
Its high-magnesium formula makes it a smart addition to nursery and landscape fertility programs where secondary and minor nutrients are needed. The dry, uniform granules are easy to distribute, help minimize dust, and can be either incorporated into growing media or surface applied. Use STEP Hi-Mag as part of a balanced fertilizer program to support healthy, vigorous ornamental growth and consistent nutrient availability.
For professional use only. Always follow the product label and conduct a small trial before making full-scale changes to the fertilizer program.
Give ornamentals the secondary and micronutrient support they need with STEP Hi-Mag Micronutrients Fertilizer – 50 lb. Formulated for professional nursery, greenhouse, and landscape ornamental programs, STEP Hi-Mag helps supplement primary fertilizer feeding with a high-magnesium micronutrient blend. It is especially useful when growing media, irrigation water, crop needs, or existing nutrient programs call for additional minor element support.
Unlike a standard N-P-K fertilizer, STEP Hi-Mag is a 0-0-0 micronutrient and secondary nutrient supplement. It delivers 12% magnesium, 9% sulfur, 8% iron, 3% manganese, 1% zinc, and 0.5% copper, helping growers maintain more complete nutrition for ornamental plants. ICL’s product information also notes that STEP Hi-Mag is dry, dense, free-flowing, and uniform in particle size, which supports even distribution and helps reduce dust during handling.
Product Snapshot
| Feature |
Details |
| Product Name |
STEP Hi-Mag Micronutrients Fertilizer |
| Bag Size |
50 lb |
| Product Type |
Granular secondary + micronutrient fertilizer supplement |
| N-P-K |
0-0-0 |
| Key Nutrients |
Magnesium, sulfur, iron, manganese, zinc, copper |
| Best For |
Container-grown and landscape ornamentals |
| Application Methods |
Incorporation into growing media or surface application |
| Use Level |
Professional use only |
| Main Benefit |
Helps supplement fertilizer programs with magnesium and essential trace elements |
Guaranteed Analysis
The following analysis is based on ICL’s official STEP Hi-Mag product page and label/rate chart.
| Nutrient |
Guaranteed Amount |
Water-Soluble Portion / Notes |
| Total Nitrogen |
0% |
N-P-K-free supplement |
| Phosphorus / Phosphate |
0% |
N-P-K-free supplement |
| Potassium / Potash |
0% |
N-P-K-free supplement |
| Magnesium (Mg) |
12.00% |
6.00% water-soluble magnesium |
| Sulfur (S) |
9.00% |
Combined sulfur |
| Copper (Cu) |
0.50% |
0.01% water-soluble copper |
| Iron (Fe) |
8.00% |
0.01% water-soluble iron |
| Manganese (Mn) |
3.00% |
2.00% water-soluble manganese |
| Zinc (Zn) |
1.00% |
0.01% water-soluble zinc |
Key Benefits
| Benefit |
Why It Matters |
| High-magnesium formula |
Supports ornamental nutrition programs where magnesium is needed |
| Complete trace element support |
Supplies iron, manganese, zinc, and copper alongside sulfur and magnesium |
| 0-0-0 formula |
Adds micronutrients without changing the main N-P-K fertilizer ratio |
| Uniform granular texture |
Helps improve application consistency and reduce dust |
| Flexible use |
Can be incorporated into media or surface applied |
| Professional ornamental focus |
Designed for container nursery stock and landscape ornamentals |
Suggested Application Rate Chart
ICL’s label/rate chart states that product selection and application rate should be based on grower practices and site factors such as climate, crop, irrigation type, growing media, rainfall, and other nutrient sources. A small-scale product trial is recommended before adopting a new fertilizer program.
Surface Application Rates per Container
| Container Size |
Approx. Containers per Cubic Yard |
Low |
Medium |
High |
| Trade 1 gal. |
300 |
2 g |
3 g |
5 g |
| Trade 2 gal. |
125 |
6 g |
7 g |
11 g |
| 3 gal. |
70 |
10 g |
13 g |
20 g |
| 5 gal. |
50 |
14 g |
18 g |
28 g |
| 7 gal. |
35 |
19 g |
25 g |
38 g |
Incorporation Rates
| Volume / Area of Mix |
Low |
Medium |
High |
| Per cubic foot |
0.9 oz |
1.2 oz |
1.8 oz |
| Per cubic yard |
1.5 lb |
2.0 lb |
3.0 lb |
| Per cubic meter |
0.9 kg |
1.2 kg |
1.8 kg |
| Per 100 sq. ft. to 6 in. depth |
2.8 lb |
3.7 lb |
5.6 lb |
| Per sq. m. to 15 cm depth |
0.13 kg |
0.18 kg |
0.27 kg |
How to Use
- Select the appropriate rate based on crop, media, irrigation, climate, and total nutrient program.
- For incorporation, blend thoroughly into the growing media for even distribution.
- For surface application, apply evenly to the container surface and water in before planting or soon after.
- Keep product away from direct contact with the stems or leaves of young plants.
- Monitor media pH and total minor nutrient availability as part of a complete fertility plan.
These usage points follow ICL’s published guidance for STEP Hi-Mag, including attention to media pH, avoiding direct contact with young plant stems or leaves, watering in, and thorough media dispersion.
