Magnesium sulfate, also known as Epsom salt, is a fertilizer used in horticulture to provide magnesium and sulfur to plants. Magnesium is an essential element for photosynthesis and aids in the formation of chlorophyll, while sulfur plays a key role in protein synthesis and enzyme activities.

Magnesium sulfate is highly soluble in water and can be easily applied through irrigation, foliar feeding, or soil application. It is ideal for correcting magnesium deficiencies, which are often visible as leaf yellowing. Due to its rapid action, magnesium sulfate supports the health and growth of crops.