Greenway Biotech Sulfate of Potash Magnesia

This formula is designed to provide potassium, magnesium, and sulfur without adding nitrogen. It is ideal for late-season feeding when you want to support root development and plant hardiness without encouraging excessive leafy growth.

Yes. With a chlorine content of less than 2.5%, this fertilizer is significantly safer for sensitive crops like potatoes, berries, and certain ornamental shrubs compared to standard potassium fertilizers.

The granular, slow-release nature of this mineral-based fertilizer ensures a steady supply of nutrients over time rather than a sudden spike. This reduces the risk of fertilizer burn and helps maintain consistent plant health throughout the growing season.

No, this product is not water-soluble. It is a granular fertilizer intended for broadcast application, where it will gradually break down into the soil to provide nutrients to the root zone.

Magnesium is essential for chlorophyll production and photosynthesis, while sulfur supports protein synthesis and overall plant vigor. Together, they help improve your plants' resistance to drought and disease.

You can apply it as a pre-plant amendment, as a top-dressing, or as a side-dressing throughout the growing season. It is particularly effective for late-season applications to help plants prepare for dormancy or to boost fruit and vegetable quality.