E.B. Stone Sul-Po-Mag

Sul-Po-Mag is a natural mineral supplement rather than a complete fertilizer. While a standard fertilizer typically provides nitrogen, phosphorus, and potassium (NPK), this product focuses specifically on delivering sulfur, potassium, and magnesium to correct deficiencies or boost plant health.

Correct. Because it lacks nitrogen and phosphorus, it should be used as a supplement alongside your regular feeding program. It is best applied when your plants need a specific boost in potassium and magnesium to support root development and foliage color.

Yes, the sulfur content in Sul-Po-Mag can help balance soil pH levels. It is particularly useful if your soil is slightly alkaline and you need to make nutrients more accessible to your plants.

It is generally safe for a wide variety of garden plants, including roses, vegetables, and ornamentals. However, because it is a concentrated mineral source, you should always follow the application rates on the bag to avoid over-fertilizing.

As a granular, natural mineral, it is not an instant fix. You will typically notice improvements in foliage color and overall plant vigor over the course of a few weeks as the nutrients break down and are absorbed by the root system.